Bump actions/download-artifact from 4 to 8 (#1185)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v4...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/coverage-comment.yml

@@ -15,7 +15,7 @@ jobs:
       pull-requests: write
     steps:
     - name: Download coverage artifact
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v8
       with:
         name: coverage
         run-id: ${{ github.event.workflow_run.id }}