Pin Cactus Comments version (latest -> 0.9.0)

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2089

roles/matrix-cactus-comments/defaults/main.yml

@@ -27,7 +27,7 @@ matrix_cactus_comments_tmp_directory_size_mb: 1
 
 matrix_cactus_comments_container_port: 5000
 
-matrix_cactus_comments_version: latest
+matrix_cactus_comments_version: 0.9.0
 matrix_cactus_comments_docker_image: "{{ matrix_container_global_registry_prefix }}cactuscomments/cactus-appservice:{{ matrix_cactus_comments_version }}"
 matrix_cactus_comments_docker_image_force_pull: "{{ matrix_cactus_comments_docker_image.endswith(':latest') }}"