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.

src/DependencyInjection/OverblogDataLoaderExtension.php

@@ -13,9 +13,9 @@
 
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 final class OverblogDataLoaderExtension extends Extension
 {