Update GHA dependencies via dependabot

[yhabteab]

Dependabot supports to automatically refresh GitHub actions as well, so we should use it to avoid such errors:
https://github.com/Icinga/icingadb/actions/runs/10903916830/job/30259089610

[lippserd]

Why the PR limit? (I know it was already there still I'm wondering why it's necessary).

[yhabteab]

I guess to limit the PRs it can create at a time, but I can also remove it, I just wanted it to be identical to the other config.

[Al2Klimov]

By default, Dependabot opens a maximum of five pull requests for version updates.

– https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#open-pull-requests-limit

[yhabteab]

Then 5 PRs a day is more than enough for the GitHub Actions, I would say.

[Al2Klimov]

5 PRs a day

This is not a rate limit:

Once there are five open pull requests from Dependabot, Dependabot will not open any new requests until some of those open requests are merged or closed.

– https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#open-pull-requests-limit

[yhabteab]

Nevertheless, the default limit is more than enough for the GA.

[yhabteab]

You have to force merge this PR though, so that it can start upgrading the dependencies from within the main branch.