mypy

gh-148441: Avoid integer overflow in Expat's CharacterDataHandler (#1… #10543

Job	Run time
Run mypy on Lib/_pyrepl	34s
Run mypy on Tools/check-c-api-docs	24s
Run mypy on Lib/test/libregrtest	33s
Run mypy on Tools/cases_generator	27s
Run mypy on Lib/tomllib	29s
Run mypy on Tools/peg_generator	29s
Run mypy on Tools/jit	26s
Run mypy on Tools/build	29s
Run mypy on Tools/clinic	34s
	4m 25s

Provide feedback