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

Author: renovate[bot]

.github/workflows/containers.yml

@@ -54,7 +54,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@15560696de535e4014efeff63c48f16952e52dd1 # v6
         with:
           context: ./
           push: true