mypy

gh-149879: Fix test_c_locale_coercion on Cygwin (#150250) #21476

Job	Run time
Run mypy on Lib/_pyrepl	20s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/build	17s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/clinic	20s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/jit	18s
Run mypy on Tools/check-c-api-docs	16s
	2m 44s

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