ci: bump ruff>=0.6.0

[dangotbanned]

https://github.com/astral-sh/ruff/releases/tag/0.6.0

Resolves the need for another PR mentioned in #3536 (comment)

[joelostblom]

Just a note if you wonder why I added an additional label to this PR @dangotbanned . We try to always have one of the labels listed here on each PR: https://github.com/vega/altair/blob/main/.github/release.yml. GitHub then organize each PR into its corresponding section of the release notes automatically when creating the release via GitHub's interface. I don't have a strong opinion about labels not listed there, so feel free to add more to that list if there are some additional labels/sections you think would be useful.

I looked into automating the addition of a label to each PR via a GitHub action based on the conventional commit type mentioned in the PR title, but there was no such action so I just check through the closed PRs every now and then and label the ones that are missing one of the four labels our release notes are based on.

[dangotbanned]

No worries @joelostblom

I won't be able to test right now, but https://github.com/vega/altair/blob/main/.github/release.yml looks like you can map multiple labels to each title?

E.g. this had the dependencies label, which could fall under maintenance.

If that can work, I think that would be worth doing as there are other labels that wouldnt be picked up currently

[joelostblom]

Yup, we can map additional labels just like you said. Another option would be to remove the labels we haven't used much in the past like dependencies and usability. I don't really have a preference since I mostly use the four other labels, but if you believe that these additional labels are useful, then I'm happy for them to be added.