Bump actions/download-artifact from 5 to 6 (#5829)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  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/build-public-images-ghcr.yml

@@ -91,7 +91,7 @@ jobs:
 
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: ${{ runner.temp }}/digests
           pattern: digests-*

.github/workflows/tracker.yml

@@ -70,7 +70,7 @@ jobs:
         run: npm --prefix ./tracker ci
 
       - name: Download blob reports from GitHub Actions Artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: all-blob-reports
           pattern: blob-report-*