mypy

gh-146076: Fix crash when a `ZoneInfo` subclass is missing a `_weak_c… #20012

Job	Run time
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/jit	24s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Lib/_pyrepl	20s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/build	19s
Run mypy on Tools/clinic	20s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/cases_generator	18s
	2m 56s

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