mypy

gh-151905: fix memory error handling in PyFrame_GetBack (#151906) #22008

Job	Run time
Run mypy on Tools/build	18s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/_pyrepl	22s
Run mypy on Tools/clinic	19s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/jit	19s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Lib/tomllib	17s
	2m 48s

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