mypy

gh-134584: Eliminate redundant refcounting from `_STORE_ATTR_WITH_HIN… #18580

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

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