mypy

gh-154821: fix data races on function attributes (#154826) #22821

Job	Run time
Run mypy on Lib/tomllib	25s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/build	23s
Run mypy on Tools/peg_generator	20s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/jit	23s
Run mypy on Lib/test/libregrtest	25s
Run mypy on Tools/clinic	26s
Run mypy on Tools/check-c-api-docs	18s
	3m 19s

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