mypy

gh-137194: Fix requires_debug_ranges when _testcpi doesn't exist (GH-… #15956

Job	Run time
Run mypy on Lib/test/libregrtest	17s
Run mypy on Tools/build	16s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/clinic	17s
Run mypy on Tools/peg_generator	17s
Run mypy on Lib/tomllib	15s
Run mypy on Tools/cases_generator	20s
Run mypy on Tools/jit	16s
	2m 16s

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