Fix Python 3.14 update_wrapper pickling with lazy annotations

[BioGeek]

Fixes #585.

Python 3.14 adds __annotate__ to functools.WRAPPER_ASSIGNMENTS, so functools.update_wrapper can copy a wrapped callable’s lazy annotation function onto wrapper instances. When the wrapped callable is a method on an annotated ABC, that copied __annotate__ can close over the class dict and reach _abc_impl, causing:

TypeError: cannot pickle '_abc._abc_data' object

This PR detects the specific redundant __annotate__ copied from __wrapped__ and removes it from the object reduction state before pickling.

This PR detects the redundant __annotate__ copied by functools.update_wrapper onto wrapper instance state and removes it before pickling. The detection does not rely on object identity with __wrapped__.__annotate__, so it also covers CPython 3.14.6 builds where the copied annotation function can be distinct from the currently exposed wrapped annotation function.

Changes

• Strip copied lazy-annotation __annotate__ functions from wrapper instance state.
• Keep the check scoped to function-valued __annotate__ attributes on objects with __wrapped__.
• Add a stdlib-only regression test using abc and `functools.update_wrapper.
• Extend the regression test to simulate a copied-but-distinct __annotate__ function.
• Add a changelog entry.

Validation

Tested the issue-comment reproducer from #585 on CPython 3.14.4, 3.14.6 and 3.15.0a7.