minor #11942 Update locale Subscriber code (Deprecated) (lbraconnier2)

This PR was merged into the 4.3 branch.

Discussion
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Update locale Subscriber  code (Deprecated)

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Commits
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281730f Update locale Subscriber  code (Deprecated)

Author: javiereguiluz

session/locale_sticky_session.rst

@@ -21,7 +21,7 @@ correct locale however you want::
     namespace App\EventSubscriber;
 
     use Symfony\Component\EventDispatcher\EventSubscriberInterface;
-    use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+    use Symfony\Component\HttpKernel\Event\RequestEvent;
     use Symfony\Component\HttpKernel\KernelEvents;
 
     class LocaleSubscriber implements EventSubscriberInterface
@@ -33,7 +33,7 @@ correct locale however you want::
             $this->defaultLocale = $defaultLocale;
         }
 
-        public function onKernelRequest(GetResponseEvent $event)
+        public function onKernelRequest(RequestEvent $event)
         {
             $request = $event->getRequest();
             if (!$request->hasPreviousSession()) {