Apply fixes from StyleCI

Author: StyleCIBot

src/usecase/contact/IndexAction.php

@@ -4,7 +4,7 @@
 
 namespace app\usecase\contact;
 
-use yii\base\{Action, InvalidConfigException};
+use yii\base\{Action};
 use yii\symfonymailer\Mailer;
 use yii\web\{Controller, Request, Session};