Update to 17.0.0

Add new app guests

defaults/main.yml

 ---
 
-nextcloud_version: 16.0.4
+nextcloud_version: 17.0.0
 nextcloud_plugins:
   - announcementcenter
   - apporder
@@ -29,6 +29,7 @@ nextcloud_plugins:
   - gpxpod
   - groupfolders
   - group_everyone
+  - guests
   - impersonate
   - maps
   - metadata