mypy

gh-142389: Add backticks to stdlib argparse help to display in colour… #21116

Job	Run time
Run mypy on Tools/check-c-api-docs	11s
Run mypy on Lib/_pyrepl	22s
Run mypy on Tools/clinic	19s
Run mypy on Lib/tomllib	21s
Run mypy on Tools/jit	18s
Run mypy on Tools/cases_generator	13s
Run mypy on Lib/test/libregrtest	19s
Run mypy on Tools/build	16s
Run mypy on Tools/peg_generator	19s
	2m 38s

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