style: use FQCN module name

ansible/roles/ssh_host_keys/tasks/main.yml

 ---
 - name: Ensure destination directory exists only if not present
-  file:
+  ansible.builtin.file:
     path: /tmp/ssh_keys
     state: directory
     mode: '0755'
@@ -24,7 +24,7 @@
     ansible_python_interpreter: /usr/bin/python3
 
 - name: Unpack SSH host keys to /etc/ssh
-  unarchive:
+  ansible.builtin.unarchive:
     src: "/tmp/ssh_keys/{{ SSH_HOST_KEYS_S3_OBJECT }}"
     dest: "/etc/ssh"
     remote_src: yes