Use fully-qualified module names for builtin Ansible modules

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

roles/matrix-etherpad/tasks/init.yml

@@ -1,12 +1,12 @@
 ---
 
-- set_fact:
+- ansible.builtin.set_fact:
     matrix_systemd_services_list: "{{ matrix_systemd_services_list + ['matrix-etherpad.service'] }}"
   when: matrix_etherpad_enabled|bool
 
 - block:
     - name: Fail if matrix-nginx-proxy role already executed
-      fail:
+      ansible.builtin.fail:
         msg: >-
           Trying to append Etherpad's reverse-proxying configuration to matrix-nginx-proxy,
           but it's pointless since the matrix-nginx-proxy role had already executed.
@@ -15,7 +15,7 @@
       when: matrix_nginx_proxy_role_executed|default(False)|bool
 
     - name: Generate Etherpad proxying configuration for matrix-nginx-proxy
-      set_fact:
+      ansible.builtin.set_fact:
         matrix_etherpad_matrix_nginx_proxy_configuration: |
           rewrite ^{{ matrix_etherpad_public_endpoint }}$ {{ matrix_nginx_proxy_x_forwarded_proto_value }}://$server_name{{ matrix_etherpad_public_endpoint }}/ permanent;
 
@@ -42,7 +42,7 @@
           }
 
     - name: Register Etherpad proxying configuration with matrix-nginx-proxy
-      set_fact:
+      ansible.builtin.set_fact:
         matrix_nginx_proxy_proxy_dimension_additional_server_configuration_blocks: |
           {{
             matrix_nginx_proxy_proxy_dimension_additional_server_configuration_blocks|default([])
@@ -54,7 +54,7 @@
   when: matrix_etherpad_enabled|bool
 
 - name: Warn about reverse-proxying if matrix-nginx-proxy not used
-  debug:
+  ansible.builtin.debug:
     msg: >-
       NOTE: You've enabled the Etherpad tool but are not using the matrix-nginx-proxy
       reverse proxy.