mypy

GH-143732: SEND specialization #20853

Job	Run time
Run mypy on Tools/peg_generator	15s
Run mypy on Lib/tomllib	20s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/clinic	18s
Run mypy on Tools/jit	19s
Run mypy on Tools/build	21s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/test/libregrtest	22s
	2m 51s

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