ifthenelse-8.x-1.x-dev-no-core/modules/contrib/admin_toolbar/admin_toolbar.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the Admin Toolbar module.
 */

/**
 * Rebuild routes to mitigate issue 2938884.
 *
 * @see https://www.drupal.org/project/admin_toolbar/issues/2938884
 */
function admin_toolbar_update_8001() {
  // Rebuilding the route cache.
  \Drupal::service("router.builder")->rebuild();
}