mypy

gh-156466: fix cleanup on error in codegen_function_annotations (#156… #23357

Job	Run time
Run mypy on Lib/tomllib	17s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/cases_generator	19s
Run mypy on Tools/clinic	17s
Run mypy on Lib/_pyrepl	21s
Run mypy on Tools/build	17s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/jit	18s
	2m 45s

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