mypy

gh-140189: Revert "Temporarily allow CI failures for iOS (#142365)" (… #18510

Job	Run time
Run mypy on Lib/tomllib	17s
Run mypy on Tools/build	21s
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/cases_generator	20s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/jit	18s
Run mypy on Tools/peg_generator	19s
	2m 29s

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