mypy

gh-101267: ProcessPoolExecutor no longer shares 1 BrokenProcessPool e… #21872

Job	Run time
Run mypy on Lib/test/libregrtest	15s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/build	13s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/clinic	20s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/peg_generator	12s
Run mypy on Tools/jit	23s
Run mypy on Tools/check-c-api-docs	17s
	2m 34s

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