fix exception issue

Author: marcelfolaron

app/Domain/Calendar/Repositories/Calendar.php

@@ -13,7 +13,6 @@
 use Leantime\Domain\Tickets\Services\Tickets;
 use Leantime\Domain\Users\Repositories\Users;
 use PDO;
-use PHPUnit\Exception;
 
 /**
  *

app/Domain/Calendar/Services/Calendar.php

@@ -277,7 +277,7 @@ public function getIcalByHash(string $userHash, string $calHash): IcalCalendar
         $calendarEvents = $this->calendarRepo->getCalendarBySecretHash($userHash, $calHash);
 
         if(!$calendarEvents) {
-            throw new Exception("Calendar could not be retrieved");
+            throw new \Exception("Calendar could not be retrieved");
         }
 
         $eventObjects = [];