mypy

gh-138122: Add differential flame graph (#145785) #20263

Job	Run time
Run mypy on Tools/clinic	17s
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/jit	16s
Run mypy on Tools/build	23s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/check-c-api-docs	19s
	2m 42s

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