[Security] Fix typehint in custom user provider

Author: norkunas

security/user_providers.rst

@@ -279,6 +279,7 @@ command will generate a nice skeleton to get you started::
 
     use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
     use Symfony\Component\Security\Core\Exception\UserNotFoundException;
+    use Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface;
     use Symfony\Component\Security\Core\User\PasswordUpgraderInterface;
     use Symfony\Component\Security\Core\User\UserInterface;
     use Symfony\Component\Security\Core\User\UserProviderInterface;
@@ -335,7 +336,7 @@ command will generate a nice skeleton to get you started::
         /**
          * Upgrades the encoded password of a user, typically for using a better hash algorithm.
          */
-        public function upgradePassword(UserInterface $user, string $newEncodedPassword): void
+        public function upgradePassword(PasswordAuthenticatedUserInterface $user, string $newEncodedPassword): void
         {
             // TODO: when encoded passwords are in use, this method should:
             // 1. persist the new password in the user storage