Bump actions/upload-artifact from 5 to 6

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

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-public-images-ghcr.yml

@@ -68,7 +68,7 @@ jobs:
           touch "${{ runner.temp }}/digests/${digest#sha256:}"
 
       - name: Upload digest
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: digests-${{ env.PLATFORM_PAIR }}
           path: ${{ runner.temp }}/digests/*

.github/workflows/tracker.yml

@@ -49,7 +49,7 @@ jobs:
         run: npm --prefix ./tracker test -- --shard=${{ matrix.shardIndex }}/${{ matrix.shardTotal }} --reporter=blob
       - name: Upload blob report to GitHub Actions Artifacts
         if: ${{ !cancelled() }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: blob-report-${{ matrix.shardIndex }}
           path: tracker/blob-report