mypy

GH-132532: Add new DSL macros to better declare semantics of exits at… #16086

Job	Run time
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/jit	19s
Run mypy on Tools/clinic	17s
Run mypy on Lib/tomllib	15s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/build	17s
Run mypy on Tools/peg_generator	19s
	2m 26s

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