mypy

gh-138122: Validate base frame before caching in remote debugging fra… #18601

Job	Run time
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/cases_generator	21s
Run mypy on Lib/tomllib	20s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Lib/_pyrepl	17s
Run mypy on Tools/clinic	15s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/jit	18s
Run mypy on Tools/build	24s
	2m 53s

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