📦 Avoid deprecated DI extension class

Author: andrew-demb

src/DependencyInjection/HttplugExtension.php

@@ -30,9 +30,9 @@
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Twig\Environment as TwigEnvironment;
 
 /**