Let TemporaryUserProvider support subclasses

Security/Core/User/TemporaryUserProvider.php

@@ -30,7 +30,7 @@ class TemporaryUserProvider implements UserProviderInterface
 
     public function supportsClass($class)
     {
-        return $class === TemporaryUser::class;
+        return is_subclass_of($class, TemporaryUser::class);
     }
 
     public function refreshUser(UserInterface $user)