mypy

gh-150766: export `_PyGC_VisitFrameStack` and `_PyGC_VisitStackRef` f… #21693

Job	Run time
Run mypy on Tools/clinic	19s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/build	17s
Run mypy on Tools/jit	22s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/peg_generator	18s
Run mypy on Lib/tomllib	20s
Run mypy on Tools/cases_generator	19s
	2m 53s

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