mypy

gh-151128: Improve SyntaxError message for cross language keywords (G… #21916

Job	Run time
Run mypy on Tools/cases_generator	15s
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/jit	21s
Run mypy on Lib/tomllib	14s
Run mypy on Tools/clinic	18s
Run mypy on Tools/build	16s
Run mypy on Tools/peg_generator	13s
	2m 34s

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