mypy

gh-137335: Fix unlikely name conflicts for named pipes in multiproces… #19669

Job	Run time
Run mypy on Tools/jit	21s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/build	16s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/_pyrepl	30s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/clinic	19s
	2m 54s

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