Remove usage of deprecated DI Extension class

Author: emodric

bundle/DependencyInjection/NetgenLayoutsIbexaExtension.php

@@ -11,10 +11,10 @@
 use Symfony\Component\Config\Loader\LoaderResolver;
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
 use Symfony\Component\DependencyInjection\Loader\GlobFileLoader;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\Yaml\Yaml;
 
 use function array_key_exists;