mypy

gh-134584: Eliminate redundant refcounting from `TO_BOOL_STR` (GH-143… #18913

Job	Run time
Run mypy on Lib/test/libregrtest	20s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/clinic	20s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	31s
Run mypy on Tools/peg_generator	18s
Run mypy on Lib/tomllib	20s
	3m 1s

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