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Fix monkeypatch.setattr() failing to undo patches to __bases__ - #15030

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Fix monkeypatch.setattr() failing to undo patches to __bases__#15030
SemTiOne wants to merge 1 commit into
pytest-dev:mainfrom
SemTiOne:fix/1938-monkeypatch-class-bases

Fix monkeypatch.setattr undo for type-level attributes like __bases__

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