ci(deps): bump actions/upload-artifact from 6 to 7 (#44)

Author: dependabot[bot]

.github/workflows/docker-build-push-multi-registry.yml

@@ -142,7 +142,7 @@ jobs:
           touch "${{ runner.temp }}/digests/${digest#sha256:}"
 
       - name: Upload digest
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: digests-${{ inputs.build-digest-key }}-${{ steps.prepare.outputs.platform-pair }}
           path: ${{ runner.temp }}/digests/*