mypy

gh-138230: Remove dead code in code gen - codegen_check_annotation is… #9580

Job	Run time
Run mypy on Lib/tomllib	17s
Run mypy on Tools/cases_generator	15s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/build	16s
Run mypy on Tools/clinic	16s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/test/libregrtest	16s
Run mypy on Tools/jit	18s
	2m 11s

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