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You can implement hook_menu_local_tasks_alter().

/**
 * Implements hook_menu_local_tasks_alter().
 */
function mymodule_menu_local_tasks_alter(&$data, $route_name, RefinableCacheableDependencyInterface &$cacheability) {
  foreach ($data['tabs'] as &$tab){
    $tab['routing_name']['#link']['url'] = Url::fromUri('https://reset.my.password/');
  }
}