style: make ansible-lint happier

roles/mastodon/tasks/redis.yml

@@ -1,12 +1,12 @@
 ---
 
-- name: install redis
-  apt:
+- name: Install redis
+  ansible.builtin.apt:
     name: redis
     state: present
     update_cache: true
 
-- name: start redis service
-  service:
+- name: Start redis service
+  ansible.builtin.service:
     name: redis
     state: started