[#5061] fixed service upgrade caused memory leak problem.

[chengyouling]

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[yanghao605]

这个修改能修复这个问题吗？DestroyMicroserviceEvent 事件看着是微服务信息被删除或者是更新实例时出现异常才会删除，如果只是频繁变更版本号应该不会触发吧