mypy

gh-138697: Fix inferring dest from a single-dash long option in argpa… #18074

Job	Run time
Run mypy on Lib/_pyrepl	19s
Run mypy on Tools/cases_generator	29s
Run mypy on Tools/jit	25s
Run mypy on Tools/build	16s
Run mypy on Tools/clinic	24s
Run mypy on Lib/test/libregrtest	26s
Run mypy on Lib/tomllib	16s
Run mypy on Tools/peg_generator	26s
	3m 1s

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