mypy

gh-148850: Fix memory sanitizer false positive in os.getrandom (GH-14… #10498

Job	Run time
Run mypy on Lib/test/libregrtest	20s
Run mypy on Tools/cases_generator	18s
Run mypy on Tools/clinic	19s
Run mypy on Lib/_pyrepl	21s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/jit	18s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/check-c-api-docs	18s
Run mypy on Tools/build	17s
	2m 46s

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