use fqcns for some task

Signed-off-by: Sebastian Gumprich <github@gumpri.ch>

roles/matrix-registration/tasks/setup_uninstall.yml

@@ -26,6 +26,6 @@
   when: "matrix_registration_service_stat.stat.exists | bool"
 
 - name: Ensure matrix-registration Docker image doesn't exist
-  docker_image:
+  community.docker.docker_image:
     name: "{{ matrix_registration_docker_image }}"
     state: absent