Update docker/setup-buildx-action action to v3

| datasource  | package                    | from | to |
| ----------- | -------------------------- | ---- | -- |
| github-tags | docker/setup-buildx-action | v1   | v3 |

Author: renovate[bot]

.github/workflows/forms-backend.yml

@@ -68,7 +68,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Docker BuildX
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v3
 
       - name: Login to Github Container Registry
         uses: docker/login-action@v3