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

Author: renovate[bot]

.github/workflows/docker.yml

@@ -31,7 +31,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}