mypy

Silence experimental coroutine deprecation warnings (#150788) #21695

Job	Run time
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/build	16s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/clinic	16s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/jit	25s
Run mypy on Lib/_pyrepl	23s
	2m 48s

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