Lint

Enable mypy parallel workers in pre-commit #7795

Job	Run time
build (3.14, windows-latest, manual)	1m 43s
build (3.14, ubuntu-latest, manual)	54s
build (3.14, ubuntu-latest, pre-push)	6m 57s
build (3.14, windows-latest, pre-commit)	2m 5s
build (3.14, windows-latest, pre-push)	7m 42s
build (3.14, ubuntu-latest, pre-commit)	1m 1s
completion-lint	3s
	20m 25s

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