mypy

ecef427d - stubtest: enable verification of `__match_args__` attributes (#12465)

stubtest: enable verification of `__match_args__` attributes (#12465) #12415 (included in release 0.942) unblocked typeshed from adding missing `__match_args__` attributes (see https://github.com/python/typeshed/pull/7556). This means stubtest is now unblocked from checking the correctness of `__match_args__` attributes in the stub!