mypy

gh-151070: Fix class referencing typo in collections.abc docs (GH-151… #21781

Job	Run time
Run mypy on Tools/cases_generator	17s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/tomllib	17s
Run mypy on Tools/jit	19s
Run mypy on Tools/check-c-api-docs	19s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/clinic	18s
Run mypy on Tools/build	43s
	3m 8s

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