Fix deprecation notice to use Symfony\Component\DependencyInjection\Extension\Extension instead of Symfony\Component\HttpKernel\DependencyInjection\Extension (absolute-quantum#64)

Author: r3hp1c

src/DependencyInjection/DoctrineEncryptExtension.php

@@ -6,8 +6,8 @@
 use Ambta\DoctrineEncryptBundle\Encryptors\HaliteEncryptor;
 use Symfony\Component\Config\FileLocator;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\Extension;
 use Symfony\Component\DependencyInjection\Loader;
-use Symfony\Component\HttpKernel\DependencyInjection\Extension;
 use Symfony\Component\HttpKernel\Kernel;
 
 /**