chore(deps): bump actions/download-artifact from 7 to 8 (#32)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...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>

Author: dependabot[bot]

.github/workflows/image-build-push.yaml

@@ -160,7 +160,7 @@ jobs:
         version: ${{fromJson(needs.define.outputs.kubernetes_versions)}}
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           pattern: digests-${{ matrix.version }}-*
           path: /tmp/digests
@@ -212,7 +212,7 @@ jobs:
         version: ${{fromJson(needs.define.outputs.kubernetes_versions)}}
     steps:
       - name: Download digests (GHCR)
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           pattern: digests-ghcr-${{ matrix.version }}-*
           path: /tmp/digests-ghcr