mypy

gh-136547: fix `hashlib_helper` for blocking and requesting digests (… #15791

Job	Run time
Run mypy on Lib/_pyrepl	19s
Run mypy on Lib/tomllib	19s
Run mypy on Lib/test/libregrtest	16s
Run mypy on Tools/cases_generator	15s
Run mypy on Tools/clinic	21s
Run mypy on Tools/peg_generator	19s
Run mypy on Tools/build	17s
Run mypy on Tools/jit	17s
	2m 23s

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