fix CS

Author: LordSimal

tests/TestCase/MigrationsTest.php

@@ -15,7 +15,6 @@
 
 use Cake\Core\Configure;
 use Cake\Core\Plugin;
-use Cake\Database\Driver\Mysql;
 use Cake\Database\Driver\Sqlserver;
 use Cake\Datasource\ConnectionManager;
 use Cake\TestSuite\TestCase;