[3.11] gh-102978: Fix mock.patch function signatures for class and staticmethod decorators (GH-103228) (#103499)

Fixes unittest.mock.patch not enforcing function signatures for methods
decorated with @classmethod or @staticmethod when patch is called with
autospec=True.

(cherry picked from commit 59e0de4903c02e72b329e505fddf1ad9794928bc)

Co-authored-by: Tomas R <tomas.roun8@gmail.com>