mypy

gh-141376: Fix exported symbols (GH-141377) #17831

Job	Run time
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/tomllib	24s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/cases_generator	14s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/build	18s
Run mypy on Tools/jit	16s
	2m 24s

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