[BUG] Typing of highlighter needs improvement

[maltevesper]

The type annotation of Highlighter.highlights should be ClassVar[tuple[str | re.pattern[str],...]] rather than implicit.

Otherwise linters (rightfully) complain that it is bad to use a mutable type (list) for a class variable (https://docs.astral.sh/ruff/rules/mutable-class-default/). Furthermore, mypy treates the variable as an instance variable and complains about it being overwritten, so it would be nice to make it a ClassVar

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[maltevesper]

I am williing to create a PR if there is traction, with 98 open PRs I am reluctant to preemptivly create one.