Update pyproject.toml

GitOrigin-RevId: ba713fc

Author: andersensam

pyproject.toml

@@ -66,7 +66,7 @@ dev = [
     "pytest-xdist",  # pytest plugin for test parallelism
     "pytest-timeout",  # pytest plugin for forcing timeout of tests
     "pytype==2024.10.11",  # type checking
-    "scikit-learn==1.5.2",  # test-only
+    "scikit-learn==1.6.1",  # test-only
     # Fix AttributeError: module 'scipy.linalg' has no attribute 'tril' and related scipy import errors.
     "scipy>=1.12.0",
     "sentencepiece != 0.1.92",