Use fully-qualified module names for builtin Ansible modules

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

roles/matrix-ntfy/tasks/self_check.yml

@@ -3,11 +3,11 @@
 # Query an arbitrary ntfy topic using ntfy's UnifiedPush topic name syntax.
 # Expect an empty response (because we query 'since=1s').
 
-- set_fact:
+- ansible.builtin.set_fact:
     matrix_ntfy_url_endpoint_public: "{{ matrix_ntfy_base_url }}/upSELFCHECK123/json?poll=1&since=1s"
 
 - name: Check ntfy
-  uri:
+  ansible.builtin.uri:
     url: "{{ matrix_ntfy_url_endpoint_public }}"
     follow_redirects: none
     validate_certs: "{{ matrix_ntfy_self_check_validate_certificates }}"
@@ -16,10 +16,10 @@
   ignore_errors: true
 
 - name: Fail if ntfy not working
-  fail:
+  ansible.builtin.fail:
     msg: "Failed checking ntfy is up at `{{ matrix_server_fqn_ntfy }}` (checked endpoint: `{{ matrix_ntfy_url_endpoint_public }}`). Is ntfy running? Is port 443 open in your firewall? Full error: {{ matrix_ntfy_self_check_result }}"
   when: "matrix_ntfy_self_check_result.failed"
 
 - name: Report working ntfy
-  debug:
+  ansible.builtin.debug:
     msg: "ntfy at `{{ matrix_server_fqn_ntfy }}` is working (checked endpoint: `{{ matrix_ntfy_url_endpoint_public }}`)"