use the right Notification Facades

app/Http/Controllers/EventsController.php

@@ -3,7 +3,7 @@
 namespace App\Http\Controllers;
 
 use App\Models\Event;
-use App\Models\Notification;
+use Illuminate\Support\Facades\Notification;
 use App\Models\Task;
 use App\Notifications\EventDeleted;
 use Illuminate\Http\Request;