Lint

Enable mypy parallel workers in pre-commit. #1480

Job	Run time
build (3.13, windows-latest, pre-commit)	1m 21s
build (3.13, windows-latest, pre-push)	1m 48s
build (3.13, ubuntu-latest, manual)	39s
build (3.13, ubuntu-latest, pre-commit)	38s
build (3.13, ubuntu-latest, pre-push)	52s
build (3.13, windows-latest, manual)	1m 8s
completion-lint	2s
	6m 28s

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