Fix types.CodeType serialization for PyPy3.11

Enable the new `inspect.signature(types.CodeType)` code path for
PyPy3.11 and newer.  Add a workaround to skip the `magic` parameter
that does not seem to be exposed (or needed).

With these changes, the serialization tests pass on PyPy3.11 7.3.19,
as well as most of the test suite.

Fixes #933

Signed-off-by: Michał Górny <mgorny@gentoo.org>

Author: mgorny

ipyparallel/serialize/codeutil.py

@@ -26,14 +26,17 @@ def code_ctor(*args):
     "codestring": "code",
     "constants": "consts",
 }
+# inspect.signature(types.CodeType) was broken in older PyPy3.10 releases
+_use_inspect_signature_ver = (3, 11) if hasattr(sys, "pypy_version_info") else (3, 10)
 # pass every supported arg to the code constructor
 # this should be more forward-compatible
 # (broken on pypy: https://github.com/ipython/ipyparallel/issues/845)
-if sys.version_info >= (3, 10) and not hasattr(sys, "pypy_version_info"):
+if sys.version_info >= _use_inspect_signature_ver:
     _code_attr_names = tuple(
         _code_attr_map.get(name, name)
         for name, param in inspect.signature(types.CodeType).parameters.items()
-        if param.POSITIONAL_ONLY or param.POSITIONAL_OR_KEYWORD
+        if (param.POSITIONAL_ONLY or param.POSITIONAL_OR_KEYWORD)
+        and not (hasattr(sys, "pypy_version_info") and name == "magic")
     )
 else:
     # can't inspect types.CodeType on Python < 3.10