mypy

gh-137440: Update comment in Python/hamt.c on importing for testing (… #16051

Job	Run time
Run mypy on Lib/tomllib	18s
Run mypy on Tools/jit	18s
Run mypy on Tools/peg_generator	20s
Run mypy on Tools/cases_generator	19s
Run mypy on Lib/test/libregrtest	16s
Run mypy on Tools/clinic	17s
Run mypy on Tools/build	18s
Run mypy on Lib/_pyrepl	16s
	2m 22s

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