mypy

gh-149816: Fix a race condition in `_PyBytes_FromList` with free-thre… #21362

Job	Run time
Run mypy on Lib/tomllib	19s
Run mypy on Tools/cases_generator	18s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/check-c-api-docs	20s
Run mypy on Lib/_pyrepl	18s
Run mypy on Tools/build	18s
Run mypy on Tools/jit	18s
Run mypy on Tools/peg_generator	21s
Run mypy on Tools/clinic	19s
	2m 50s

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