mypy

Docs: an "improve this page" feature (#144939) #19566

Job	Run time
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/jit	21s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/build	17s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/clinic	22s
	2m 52s

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