message: fix gdbinit script
diff: @@ -113,7 +113,7 @@ define __co_bt
  set $cid = (int)$arg0
  set $co = swoole_coro_get($cid)
  if $co
  - set $task = (php_coro_task *) $co->task
  + set $task = ('swoole::PHPContext' *) $co->get_task()
  if $task
  sw_dump_bt $task->execute_data
  end
  