use fqcns for some task

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

roles/matrix-dendrite/tasks/dendrite/setup_uninstall.yml

@@ -25,6 +25,6 @@
   when: "matrix_dendrite_service_stat.stat.exists"
 
 - name: Ensure Dendrite Docker image doesn't exist
-  docker_image:
+  community.docker.docker_image:
     name: "{{ matrix_dendrite_docker_image }}"
     state: absent