Change mysql_user to fqcn community.mysql.mysql_user to prevent dprecation warnings

Author: s-hell

tasks/users.yml

@@ -1,6 +1,6 @@
 ---
 - name: Ensure MySQL users are present.
-  mysql_user:
+  ansible.mysql.mysql_user:
     name: "{{ item.name }}"
     host: "{{ item.host | default('localhost') }}"
     password: "{{ item.password }}"