mypy

gh-141679: Add colour to defaults in `argparse` help #18097

Job	Run time
Run mypy on Lib/_pyrepl	22s
Run mypy on Lib/test/libregrtest	23s
Run mypy on Lib/tomllib	19s
Run mypy on Tools/build	15s
Run mypy on Tools/cases_generator	16s
Run mypy on Tools/clinic	16s
Run mypy on Tools/jit	21s
Run mypy on Tools/peg_generator	20s
	2m 32s

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