mypy

gh-153761: Fix asyncio sock_accept() dropping a connection when cance… #22521

Job	Run time
Run mypy on Tools/build	34s
Run mypy on Tools/jit	31s
Run mypy on Tools/check-c-api-docs	33s
Run mypy on Tools/cases_generator	32s
Run mypy on Lib/test/libregrtest	34s
Run mypy on Tools/peg_generator	32s
Run mypy on Lib/_pyrepl	29s
Run mypy on Tools/clinic	30s
Run mypy on Lib/tomllib	33s
	4m 48s

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