#90826 introduced a change to `GetUserPrivilegesResponse` which breaks our `CustomAuthorizationEngine` example plugin. We'll need to update the plugin example here.

cc @n1v0lg
plugins/examples/security-authorization-engine/src/main/java/org/elasticsearch/example/CustomAuthorizationEngine.java
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */
package org.elasticsearch.example;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.cluster.metadata.IndexAbstraction;
import org.elasticsearch.xpack.core.security.action.user.GetUserPrivilegesResponse;