chore: upgrade ronebot to 2.4.5

src/main/kotlin/cn/rtast/fancybot/commands/niuzi/NiuziSignCommand.kt

@@ -11,8 +11,8 @@ import cn.rtast.fancybot.annotations.CommandDescription
 import cn.rtast.fancybot.niuziManager
 import cn.rtast.fancybot.util.misc.getUserName
 import cn.rtast.rob.entity.GroupMessage
+import cn.rtast.rob.onebot.MessageChain
 import cn.rtast.rob.util.BaseCommand
-import cn.rtast.rob.util.ob.MessageChain
 
 @CommandDescription("牛子签到~")
 class NiuziSignCommand : BaseCommand() {