fix(updatenotification): Communicate app_api as shipped in 30+

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

apps/updatenotification/lib/Controller/APIController.php

@@ -60,6 +60,7 @@ class APIController extends OCSController {
 		'twofactor_totp' => 25,
 		'files_downloadlimit' => 29,
 		'twofactor_nextcloud_notification' => 30,
+		'app_api' => 30,
 	];
 
 	public function __construct(