mypy

gh-139707: Add mechanism for distributors to supply error messages for missing stdlib modules #17840

Job	Run time
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/build	23s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/jit	18s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/peg_generator	23s
	2m 32s

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