mypy

gh-149879: Fix test_tarfile on Cygwin (#149897) #21356

Job	Run time
Run mypy on Tools/jit	21s
Run mypy on Tools/build	17s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/clinic	19s
Run mypy on Tools/cases_generator	16s
Run mypy on Lib/tomllib	21s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Lib/_pyrepl	22s
Run mypy on Tools/peg_generator	18s
	2m 51s

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