Fix: Missing colon in nullable return type declaration

analyticshub/lib/Service/GoogleAnalyticsService.php

@@ -487,7 +487,7 @@ class GoogleAnalyticsService {
     /**
      * Ensure Nextcloud folder exists
      */
-    private function ensureNextcloudFolder(string $path) ?\OCP\Files\Folder {
+    private function ensureNextcloudFolder(string $path): ?\OCP\Files\Folder {
         $userFolder = \OC::$server->getUserFolder();
 
         if (!$userFolder->nodeExists($path)) {