mypy

gh-144386: Add support for descriptors in ExitStack and AsyncExitStac… #19381

Job	Run time
Run mypy on Tools/check-c-api-docs	22s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/build	17s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/jit	17s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/clinic	21s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/peg_generator	22s
	2m 54s

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