mypy

gh-143637: Fix test_socket.test_sendmsg_reentrant_ancillary_mutation(… #19550

Job	Run time
Run mypy on Lib/tomllib	17s
Run mypy on Tools/clinic	21s
Run mypy on Tools/jit	18s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Lib/_pyrepl	15s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/build	20s
Run mypy on Tools/peg_generator	17s
	2m 45s

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