Use correct Extension class per Symfony deprecation

Author: Lustmored

src/DependencyInjection/FOSElasticaExtension.php

@@ -21,9 +21,9 @@
 use Symfony\Component\DependencyInjection\ContainerAwareInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Exception\LogicException;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\Messenger\MessageBusInterface;
 
 /**