[Security] remove some legacy

Author: nicolas-grekas

Tests/Security/CheckLdapCredentialsListenerTest.php

@@ -30,6 +30,7 @@
 use Symfony\Component\Security\Http\Authenticator\Passport\Badge\UserBadge;
 use Symfony\Component\Security\Http\Authenticator\Passport\Credentials\PasswordCredentials;
 use Symfony\Component\Security\Http\Authenticator\Passport\Passport;
+use Symfony\Component\Security\Http\Authenticator\Passport\PassportInterface;
 use Symfony\Component\Security\Http\Authenticator\Passport\SelfValidatingPassport;
 use Symfony\Component\Security\Http\Event\CheckPassportEvent;
 use Symfony\Contracts\Service\ServiceLocatorTrait;
@@ -202,6 +203,9 @@ public function authenticate(Request $request): Passport
     {
     }
 
+    /**
+     * @internal for compatibility with Symfony 5.4
+     */
     public function createAuthenticatedToken(PassportInterface $passport, string $firewallName): TokenInterface
     {
     }