fix: resolve unability to change vars in playbook

defaults/main.yml

 ---
+
+timezone: "Europe/Paris"
+traefik_version: "latest"
+
 default_maintenance_email: "maintenance@example.org"
 default_sshd_port: 10022
 docker_userns_remap: true

vars/main.yml

----
-timezone: "Europe/Paris"
-traefik_version: "v2.10"