Update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/main.yml

@@ -42,7 +42,7 @@ jobs:
         run: "bash .github/workflows/gen_tags.sh"
 
       - name: Build and push containers
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64,linux/arm64/v8
           push: ${{ github.event_name != 'pull_request' }}