Use fully-qualified module names for builtin Ansible modules

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1939

roles/matrix-client-cinny/tasks/validate_config.yml

@@ -1,6 +1,6 @@
 ---
 - name: Fail if required Cinny settings not defined
-  fail:
+  ansible.builtin.fail:
     msg: >
       You need to define a required configuration setting (`{{ item }}`) to use Cinny.
   when: "vars[item] == '' or vars[item] is none"