ci: update action name

Author: saitho

.github/workflows/test-integration.yml

@@ -114,7 +114,7 @@ jobs:
           token: "${{ secrets.CLOUDFLARE_TOKEN }}"
           zone: "${{ secrets.CLOUDFLARE_ZONE }}"
       - name: Perform integration test
-        uses: ./actions/integration-test
+        uses: getstackhead/stackhead/actions/integration-test@next
         with:
           ipaddress: ${{ steps.setup_server.outputs.hcloud_server_created_ipv4 }}
           domain: '${{ env.DOMAIN_PREFIX }}.${{ env.DOMAIN }}'