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

Author: renovate[bot]

.github/workflows/build-container.yml

@@ -49,7 +49,7 @@ jobs:
           fi
 
       - name: Build and push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: Containerfile