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mypy

gh-161204: Allow '-jN%' form of regrtest '-j' option #25073

Job	Run time
Run mypy on Lib/tomllib	23s
Run mypy on Tools/cases_generator	1m 34s
Run mypy on Lib/_pyrepl	12s
Run mypy on Tools/jit	26s
Run mypy on Tools/check-c-api-docs	23s
Run mypy on Tools/clinic	22s
Run mypy on Tools/build	34s
Run mypy on Lib/test/libregrtest	18s
Run mypy on Tools/peg_generator	21s
	4m 33s