Revert `scipy<1.16.0` pin

[TomAugspurger]

https://github.com/rapidsai/dask-upstream-testing/actions/runs/15842955083/job/44658923441#step:11:1399

___________________________ test_lbfgs[True-False-2] ___________________________
Traceback (most recent call last):
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/_pytest/runner.py", line 341, in from_call
    result: Optional[TResult] = func()
                                ^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/_pytest/runner.py", line 262, in <lambda>
    lambda: ihook(item=item, **kwds), when=when, reraise=reraise
            ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_hooks.py", line 512, in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_manager.py", line 120, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 167, in _multicall
    raise exception
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
    teardown.throw(exception)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
    return result.get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_result.py", line 103, in get_result
    raise exc.with_traceback(tb)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
    res = yield
          ^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
    teardown.throw(exception)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
    return result.get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_result.py", line 103, in get_result
    raise exc.with_traceback(tb)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
    res = yield
          ^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
    teardown.throw(exception)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
    return result.get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_result.py", line 103, in get_result
    raise exc.with_traceback(tb)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
    res = yield
          ^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
    teardown.throw(exception)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
    return result.get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_result.py", line 103, in get_result
    raise exc.with_traceback(tb)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
    res = yield
          ^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
    teardown.throw(exception)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
    return result.get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_result.py", line 103, in get_result
    raise exc.with_traceback(tb)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
    res = yield
          ^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
    teardown.throw(exception)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
    return result.get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_result.py", line 103, in get_result
    raise exc.with_traceback(tb)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
    res = yield
          ^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
    teardown.throw(exception)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 53, in run_old_style_hookwrapper
    return result.get_result()
           ^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_result.py", line 103, in get_result
    raise exc.with_traceback(tb)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 38, in run_old_style_hookwrapper
    res = yield
          ^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 121, in _multicall
    res = hook_impl.function(*args)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/_pytest/runner.py", line 177, in pytest_runtest_call
    raise e
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/_pytest/runner.py", line 169, in pytest_runtest_call
    item.runtest()
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/_pytest/python.py", line 1792, in runtest
    self.ihook.pytest_pyfunc_call(pyfuncitem=self)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_hooks.py", line 512, in __call__
    return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_manager.py", line 120, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 167, in _multicall
    raise exception
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/pluggy/_callers.py", line 121, in _multicall
    res = hook_impl.function(*args)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/_pytest/python.py", line 194, in pytest_pyfunc_call
    result = testfunction(**testargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/packages/cuml/python/cuml/cuml/tests/dask/test_dask_logistic_regression.py", line 357, in test_lbfgs
    lr = _test_lbfgs(
         ^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/packages/cuml/python/cuml/cuml/tests/dask/test_dask_logistic_regression.py", line 310, in _test_lbfgs
    sk_model.fit(X, y)
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/sklearn/base.py", line 1363, in wrapper
    return fit_method(estimator, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/sklearn/linear_model/_logistic.py", line 1376, in fit
    fold_coefs_ = Parallel(n_jobs=self.n_jobs, verbose=self.verbose, prefer=prefer)(
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/sklearn/utils/parallel.py", line 82, in __call__
    return super().__call__(iterable_with_config_and_warning_filters)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/joblib/parallel.py", line 1986, in __call__
    return output if self.return_generator else list(output)
                                                ^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/joblib/parallel.py", line 1914, in _get_sequential_output
    res = func(*args, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/sklearn/utils/parallel.py", line 147, in __call__
    return self.function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/sklearn/linear_model/_logistic.py", line 456, in _logistic_regression_path
    opt_res = optimize.minimize(
              ^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/scipy/optimize/_minimize.py", line 785, in minimize
    res = _minimize_lbfgsb(fun, x0, args, jac, bounds,
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/scipy/optimize/_lbfgsb_py.py", line 387, in _minimize_lbfgsb
    warnings.warn("scipy.optimize: The `disp` and `iprint` options of the "
  File "/__w/dask-upstream-testing/dask-upstream-testing/.venv/lib/python3.12/site-packages/rapids_dask_dependency/utils.py", line 16, in _warning_with_increased_stacklevel
    original_warn(message, category, stacklevel + level, source, **kwargs)
DeprecationWarning: scipy.optimize: The `disp` and `iprint` options of the L-BFGS-B solver are deprecated and will be removed in SciPy 1.18.0.

[TomAugspurger]

#64 added a temporary pin to scipy<1.16.0; Once cuml's test suite is compatible with scipy 1.16.0 we'll be good to revert that pin.

[TomAugspurger]

The actual warning is probably from scikit-learn calling scipy. scikit-learn/scikit-learn#31642 is fixing this in scikit-learn, so we can unpin scipy once that's released.