Unable to alter local actions prior to rendering

Same as 📌 Rename hook_menu_local_actions_alter() to hook_local_actions_alter() Needs work can we update the MR for 10.1 please

Working well for us. We are using this to set a specific route parameter based on external information:

      /** @var \Drupal\Core\Url $url */
      $url = &$local_actions['local_action.id']['#link']['url'];
      $url->setRouteParameter('node', $node->id());

A word to the wise: don't be like me and remember that you may likely need to have a method of invalidating the cache for this rendered item.

Please review.

Appears this was just a copy but not updated for 10.1 but should be simple.