Remove usage of the deprecated base extension from HttpKernel

The base extension available in HttpKernel only adds support for
registering some classes to be added in the cache warmer of the
doctrine/annotations parser, compared to the base class of the DI
component.
As annotations are not supported anymore in Symfony 7, this base class
has been deprecated in Symfony 7.1.
As this bundle does not rely on the extra feature, it can use the base
class from DI directly.

DependencyInjection/SwarrotExtension.php

@@ -5,9 +5,9 @@
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ChildDefinition;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader\XmlFileLoader;
 use Symfony\Component\DependencyInjection\Reference;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 
 /**
  * SwarrotExtension.