mypy

gh-146287: Fix signed/unsigned mismatch in _hashlib_hmac_digest_size … #20634

Job	Run time
Run mypy on Tools/peg_generator	15s
Run mypy on Lib/_pyrepl	16s
Run mypy on Tools/check-c-api-docs	17s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/clinic	15s
Run mypy on Tools/jit	19s
Run mypy on Lib/tomllib	18s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/build	18s
	2m 32s

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