mypy

gh-146556: Fix infinite loop in annotationlib.get_annotations() on ci… #20257

Job	Run time
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/jit	21s
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/build	17s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/peg_generator	18s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/clinic	17s
	2m 49s

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