Update Extension to meet Symfony 7.1 deprecation

Symfony 7.1 deprecation:

The "Symfony\Component\HttpKernel\DependencyInjection\Extension" class is
considered internal since Symfony 7.1, to be deprecated in 8.1;
use Symfony\Component\DependencyInjection\Extension\Extension instead.

Author: jerowork

src/DependencyInjection/OverblogGraphQLExtension.php

@@ -26,10 +26,10 @@
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 use function realpath;
 use function sprintf;