mypy

gh-144652: Support Windows exit status in support get_signal_name() (… #19464

Job	Run time
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/build	19s
Run mypy on Tools/jit	17s
Run mypy on Tools/cases_generator	24s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	18s
	2m 52s

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