mypy

gh-142374: Fix recursive function cumulative over-counting in samplin… #18456

Job	Run time
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/clinic	18s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/jit	22s
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/build	16s
Run mypy on Lib/_pyrepl	18s
	2m 28s

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