mypy

gh-148483: Use Py_GCC_ATTRIBUTE(unused) for stop_tracing label (GH-14… #20679

Job	Run time
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/build	18s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/jit	20s
Run mypy on Lib/_pyrepl	27s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/clinic	22s
	2m 57s

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