chore(deps): bump actions/download-artifact from 6 to 8

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v6...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/check-urls.yml

@@ -122,7 +122,7 @@ jobs:
         uses: actions/checkout@v5
         # download and unzip the ab-results-*.json generated by job-matrix: check-urls
       - name: Download artifacts
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
       - name: Generate Summary Report
         uses: ./.github/actions/awesomebot-gh-summary-action
         with: