Lint

Bump mypy to 2.0.0 and enable parallel checking (#3146) #7791

Job	Run time
build (3.14, windows-latest, manual)	2m 4s
build (3.14, windows-latest, pre-commit)	2m 38s
build (3.14, ubuntu-latest, pre-push)	7m 33s
build (3.14, ubuntu-latest, pre-commit)	56s
build (3.14, windows-latest, pre-push)	8m 6s
build (3.14, ubuntu-latest, manual)	59s
completion-lint	4s
	22m 20s

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