T8463: Update GitHub actions to latest versions

[asklymenko]

Change Summary

Update GitHub actions to the latest versions:

actions/download-artifact@v8
actions/upload-artifact@v7
actions/checkout@v6
actions/setup-python@v6
actions/labeler@v6
actions/github-script@v9
actions/stale@v10

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Other (please describe): build system maintenance

Related Task(s)

• https://vyos.dev/TT8463

Related PR(s)

Proposed changes

How to test

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch T8463-current

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch T8463-current

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[dmbaturin]

I made those updates in some personal projects lately and didn't see any issues so I'm confident that it should not cause any trouble here, either.

[asklymenko]

@Mergifyio backport circinus

[mergify]

backport circinus

✅ Backports have been created

Details

• #118 T8463: Update GitHub actions to latest versions (backport #117) has been created for branch circinus but encountered conflicts

Cherry-pick of 8071a41 has failed:

On branch mergify/bp/circinus/pr-117
Your branch is up to date with 'origin/circinus'.

You are currently cherry-picking commit 8071a41.
  (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)

Changes to be committed:
	modified:   .github/workflows/add-pr-labels.yml
	modified:   .github/workflows/check-pr-merge-conflict.yml
	modified:   .github/workflows/check-pr-message.yml
	modified:   .github/workflows/check-stale.yml
	modified:   .github/workflows/check-unused-imports.yml
	modified:   .github/workflows/label-backport.yml
	modified:   .github/workflows/lint-doc.yml

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/add-rebase-label.yml
	both modified:   .github/workflows/codeql-analysis.yml
	both modified:   .github/workflows/lint-j2.yml
	deleted by us:   .github/workflows/lint-with-darker-ruff.yml
	deleted by us:   .github/workflows/lint-with-ruff.yml
	deleted by us:   .github/workflows/pr-mirror-repo-sync.yml

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