mypy

gh-149879: Fix test_termios and test_ioctl on Cygwin (#150412) #21554

Job	Run time
Run mypy on Tools/cases_generator	20s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/clinic	18s
Run mypy on Tools/jit	18s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/build	17s
Run mypy on Lib/_pyrepl	21s
	2m 51s

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