[8.17](backport #16605) deps(gh-actions): use main for the elastic gh actions

[mergify]

Motivation/summary

We trust the elastic GH actions, and that can help us to ship new features faster

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Related issues

---

This is an automatic backport of pull request #16605 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 9d8df85 has failed:

On branch mergify/bp/8.17/pr-16605
Your branch is up to date with 'origin/8.17'.

You are currently cherry-picking commit 9d8df853.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/docs-build.yml
	deleted by us:   .github/workflows/docs-cleanup.yml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

This pull request has not been merged yet. Could you please review and merge it @v1v? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @v1v? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @v1v? 🙏