mypy

gh-150641: Fix evaluating forward references in STRING format can 'le… #22289

Job	Run time
Run mypy on Lib/test/libregrtest	29s
Run mypy on Tools/build	32s
Run mypy on Lib/tomllib	33s
Run mypy on Tools/cases_generator	31s
Run mypy on Lib/_pyrepl	30s
Run mypy on Tools/jit	30s
Run mypy on Tools/clinic	32s
Run mypy on Tools/check-c-api-docs	28s
Run mypy on Tools/peg_generator	29s
	4m 34s

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