[GF] Removed unused import

Author: Giacomo Fabbian

src/Jenssegers/Mongodb/Eloquent/Model.php

@@ -2,7 +2,6 @@
 
 namespace Jenssegers\Mongodb\Eloquent;
 
-use Illuminate\Support\Carbon;
 use DateTime;
 use Illuminate\Contracts\Queue\QueueableCollection;
 use Illuminate\Contracts\Queue\QueueableEntity;