mypy

gh-143635: Fix crash in `ga_repr_items_list` (#143670) #10069

Job	Run time
Run mypy on Tools/check-c-api-docs	15s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/tomllib	17s
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/build	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	18s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/peg_generator	21s
	2m 41s

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