mypy

gh-145883: Fix two heap-buffer-overflows in `_zoneinfo` (#145885) #20399

Job	Run time
Run mypy on Tools/build	18s
Run mypy on Lib/tomllib	20s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/peg_generator	16s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	19s
Run mypy on Lib/_pyrepl	17s
	2m 44s

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