mypy

gh-146615: Fix crash in get() for METH_METHOD descriptors with in… #20279

Job	Run time
Run mypy on Lib/tomllib	20s
Run mypy on Tools/jit	20s
Run mypy on Lib/test/libregrtest	23s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/build	20s
Run mypy on Tools/clinic	18s
Run mypy on Tools/peg_generator	19s
	2m 58s

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