minor #17595 [Security] Update locale with new authentication system (r-ant-2468)

This PR was submitted for the 6.2 branch but it was merged into the 6.3 branch instead.

Discussion
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[Security] Update locale with new authentication system

For the new authentication system, the LoginSuccessEvent event that is fired after logging in. This is to be updated in the new documentation

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Commits
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9559087 Update locale with new authentication system

Author: javiereguiluz

session.rst

@@ -1469,16 +1469,15 @@ this as the locale for the given user. To accomplish this, you can hook into
 the login process and update the user's session with this locale value before
 they are redirected to their first page.
 
-To do this, you need an event subscriber on the ``security.interactive_login``
+To do this, you need an event subscriber on the ``LoginSuccessEvent::class``
 event::
 
     // src/EventSubscriber/UserLocaleSubscriber.php
     namespace App\EventSubscriber;
 
     use Symfony\Component\EventDispatcher\EventSubscriberInterface;
     use Symfony\Component\HttpFoundation\RequestStack;
-    use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;
-    use Symfony\Component\Security\Http\SecurityEvents;
+    use Symfony\Component\Security\Http\Event\LoginSuccessEvent;
 
     /**
      * Stores the locale of the user in the session after the
@@ -1491,9 +1490,9 @@ event::
         ) {
         }
 
-        public function onInteractiveLogin(InteractiveLoginEvent $event): void
+        public function onLoginSuccess(LoginSuccessEvent $event): void
         {
-            $user = $event->getAuthenticationToken()->getUser();
+            $user = $event->getUser();
 
             if (null !== $user->getLocale()) {
                 $this->requestStack->getSession()->set('_locale', $user->getLocale());
@@ -1503,7 +1502,7 @@ event::
         public static function getSubscribedEvents(): array
         {
             return [
-                SecurityEvents::INTERACTIVE_LOGIN => 'onInteractiveLogin',
+                LoginSuccessEvent::class => 'onLoginSuccess',
             ];
         }
     }