mypy

gh-153631: Move to `macos-26` runner for iOS (#153632) #22492

Job	Run time
Run mypy on Tools/build	30s
Run mypy on Tools/check-c-api-docs	33s
Run mypy on Lib/tomllib	34s
Run mypy on Tools/jit	30s
Run mypy on Tools/clinic	29s
Run mypy on Lib/test/libregrtest	30s
Run mypy on Tools/cases_generator	31s
Run mypy on Lib/_pyrepl	33s
Run mypy on Tools/peg_generator	33s
	4m 43s

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