mailman3: fix a name[casing] lint warning

roles/mailman3/tasks/main.yml

@@ -69,7 +69,7 @@
     - mailman3-notify.timer
     - uwsgi@mailman\x2dweb.service
 
-- name: update list configurations
+- name: Update list configurations
   uri:
     url: http://localhost:8001/3.1/lists/{{ item }}.lists.archlinux.org/config
     user: "{{ vault_mailman_admin_user }}"