mypy

gh-139038: Add JIT What's New for 3.15 (#142845) #18595

Job	Run time
Run mypy on Tools/build	18s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/clinic	17s
Run mypy on Lib/_pyrepl	23s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/check-c-api-docs	21s
Run mypy on Lib/tomllib	21s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/jit	21s
	2m 58s

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