fix gitlab tests

app/Services/PublicWinners/PublicWinnersPortalService.php

@@ -2,14 +2,12 @@
 
 namespace App\Services\PublicWinners;
 
-use App\Controllers\WinnersController;
 use App\Models\ClassSection;
 use App\Models\Competition;
-use Carbon\CarbonInterface;
 use Illuminate\Support\Facades\DB;
 
 /**
- * legacy {@see WinnersController} — public published winners pages.
+ * legacy {@see \App\Controllers\WinnersController} — public published winners pages.
  */
 class PublicWinnersPortalService
 {
@@ -106,7 +104,7 @@ class PublicWinnersPortalService
     {
         $arr = $c->toArray();
         foreach ($arr as $key => $value) {
-            if ($value instanceof CarbonInterface) {
+            if ($value instanceof \Carbon\CarbonInterface) {
                 $arr[$key] = $value->format('Y-m-d H:i:s');
             }
         }