mypy

gh-139837: Document attributes of objects recorded by warnings.catch_… #21892

Job	Run time
Run mypy on Lib/_pyrepl	17s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	18s
Run mypy on Tools/cases_generator	18s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/build	16s
	2m 33s

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