mypy

gh-150524: Remove outdated note in binascii.a2b_hex() documentation (… #21648

Job	Run time
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/test/libregrtest	21s
Run mypy on Tools/build	17s
Run mypy on Tools/cases_generator	20s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/check-c-api-docs	16s
Run mypy on Tools/clinic	19s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/jit	18s
	2m 43s

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