mypy

gh-143241: Fix infinite loop in `zoneinfo._common.load_data` (#143243) #18777

Job	Run time
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/build	24s
Run mypy on Lib/_pyrepl	22s
Run mypy on Lib/tomllib	21s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/jit	19s
Run mypy on Tools/clinic	18s
	2m 56s

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