Removed incorrect imports

Author: jaxwilko

modules/system/classes/UpdateManager.php

@@ -5,14 +5,9 @@
 use Carbon\Carbon;
 use Cms\Classes\ThemeManager;
 use Exception;
-use Illuminate\Database\Migrations\DatabaseMigrationRepository;
-use Illuminate\Database\Migrations\Migrator;
 use Illuminate\Support\Facades\App;
-use Mix\TestA\Plugin;
-use System\Classes\Core\MarketPlaceApi;
 use System\Classes\Extensions\ModuleManager;
 use System\Classes\Extensions\PluginManager;
-use System\Helpers\Cache as CacheHelper;
 use System\Models\Parameter;
 use Winter\Storm\Exception\ApplicationException;
 use Winter\Storm\Exception\SystemException;