chore(deps): update actions/upload-artifact action to v7

Author: renovate[bot]

.github/workflows/docker.yaml

@@ -52,7 +52,7 @@ jobs:
           touch "/tmp/digests/${digest#sha256:}"
 
       - name: Upload digest
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: digests-${{ matrix.key }}
           path: /tmp/digests/*