mypy

gh-146613: Fix re-entrant use-after-free in `itertools._grouper` (#14… #20345

Job	Run time
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/jit	22s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	19s
Run mypy on Tools/build	17s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/peg_generator	20s
	2m 51s

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