mypy

gh-148659: Export some internal functions for the JIT (PEP-523) (#148… #20761

Job	Run time
Run mypy on Lib/test/libregrtest	23s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	19s
Run mypy on Tools/build	17s
Run mypy on Tools/jit	18s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/tomllib	20s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/cases_generator	17s
	2m 48s

Provide feedback