mypy

gh-138525: Support single-dash long options and prefix_chars in Boole… #18095

Job	Run time
Run mypy on Lib/test/libregrtest	23s
Run mypy on Tools/build	17s
Run mypy on Tools/clinic	24s
Run mypy on Lib/_pyrepl	20s
Run mypy on Lib/tomllib	18s
Run mypy on Tools/peg_generator	17s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/jit	19s
	2m 35s

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