mypy

gh-137078: Fix keyword typo recognition when executed over files (#13… #9489

Job	Run time
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/build	17s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/jit	22s
Run mypy on Tools/clinic	24s
Run mypy on Tools/peg_generator	15s
	2m 25s

Provide feedback