mypy

gh-150633: Minor improvement of a newly added test (#151103) #21780

Job	Run time
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/build	19s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/clinic	22s
Run mypy on Tools/jit	19s
Run mypy on Tools/cases_generator	21s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Lib/tomllib	18s
	3m 0s

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