mypy

gh-137341: Remove more word duplications #15991

Job	Run time
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/build	21s
Run mypy on Tools/clinic	19s
Run mypy on Tools/jit	17s
Run mypy on Tools/peg_generator	16s
Run mypy on Tools/cases_generator	23s
	2m 33s

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