[5.3] cs fixes

Author: nicolas-grekas

Resources/config/mailer_debug.php

@@ -12,7 +12,6 @@
 namespace Symfony\Component\DependencyInjection\Loader\Configurator;
 
 use Symfony\Component\Mailer\DataCollector\MessageDataCollector;
-use Symfony\Component\Mailer\EventListener\MessageLoggerListener;
 
 return static function (ContainerConfigurator $container) {
     $container->services()