chore(deps): update docker/build-push-action action to v6 (#6334)

.github/workflows/rebuild_backup_image.yml

@@ -30,7 +30,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64