Update Azure/k8s-deploy action to v5

| datasource  | package          | from | to |
| ----------- | ---------------- | ---- | -- |
| github-tags | Azure/k8s-deploy | v1   | v5 |

Author: renovate[bot]

.github/workflows/forms-backend.yml

@@ -114,7 +114,7 @@ jobs:
           kubeconfig: ${{ secrets.KUBECONFIG }}
 
       - name: Deploy to Kubernetes
-        uses: Azure/k8s-deploy@v1
+        uses: Azure/k8s-deploy@v5
         with:
           namespace: forms
           manifests: |