Use fully-qualified module names for builtin Ansible modules

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

roles/matrix-jitsi/tasks/validate_config.yml

@@ -1,7 +1,7 @@
 ---
 
 - name: Fail if required Jitsi settings not defined
-  fail:
+  ansible.builtin.fail:
     msg: >-
       You need to define a required configuration setting (`{{ item }}`) to properly configure Jitsi.
 
@@ -21,7 +21,7 @@
 
 
 - name: Fail if a Jitsi internal authentication account is not defined
-  fail:
+  ansible.builtin.fail:
     msg: >-
       At least one Jitsi user needs to be defined in `matrix_jitsi_prosody_auth_internal_accounts` when using internal authentication.
       If you're setting up Jitsi for the first time, you may have missed a step.
@@ -33,7 +33,7 @@
 
 
 - name: (Deprecation) Catch and report renamed settings
-  fail:
+  ansible.builtin.fail:
     msg: >-
       Your configuration contains a variable, which now has a different name.
       Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).