Fix a indentation mistake.

tasks/swarm_mgr.yml

@@ -26,9 +26,9 @@
       register: swarm_info_data
 
     - name: swarm_mgr | Get the swarm manager token
-      set_fact:
+      ansible.builtin.set_fact:
         docker_swarm_mgr_token: '{{ swarm_info_data.swarm_facts.JoinTokens.Manager }}'
-      cacheable: true
+        cacheable: true
 
 - block:
   - name: Add some manager nodes to the docker swarm cluster