mypy

gh-146907: Clarify ABI compatibility between debug and release builds… #20316

Job	Run time
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/build	17s
Run mypy on Tools/jit	17s
Run mypy on Tools/clinic	18s
Run mypy on Tools/peg_generator	19s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/cases_generator	22s
Run mypy on Lib/_pyrepl	18s
	2m 47s

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