mypy

gh-142598: Add new type of executable to support external JITs #19226

Job	Run time
Run mypy on Lib/tomllib	39s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/jit	24s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	21s
Run mypy on Tools/build	20s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/check-c-api-docs	18s
	3m 20s

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