mypy

gh-145559: Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebac… #21196

Job	Run time
Run mypy on Tools/cases_generator	18s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/clinic	16s
Run mypy on Tools/build	26s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/jit	19s
Run mypy on Tools/peg_generator	16s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/check-c-api-docs	19s
	2m 47s

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