mypy

gh-154352: Fix killing a worker process in regrtest on OpenBSD #22702

Job	Run time
Run mypy on Tools/check-c-api-docs	29s
Run mypy on Lib/tomllib	31s
Run mypy on Lib/_pyrepl	31s
Run mypy on Tools/clinic	33s
Run mypy on Tools/build	29s
Run mypy on Tools/cases_generator	30s
Run mypy on Tools/jit	30s
Run mypy on Tools/peg_generator	31s
Run mypy on Lib/test/libregrtest	33s
	4m 37s

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