可以把#5135合并到2.6.x吗，我们使用2.6.x也遇到了同样的情况

在生产环境中，服务出现了与zookeeper连接波动后大量provider注册信息丢失的问题。查找issues，发现2.7.4版本有相关问题的补丁，是否可以把补丁合到2.6.x分支。

[fix re-register can not work when curator session expires.]
(https://github.com/apache/dubbo/pull/5135)
[[Dubbo-5125] 修复provider在网络波动恢复后，无法正确恢复在zookeeper的注册信息 #5125 #5126](https://github.com/apache/dubbo/pull/5126)

Start by reviewing the fixes referenced in pull requests #5135 and #5126, then compare their scope with the 2.6.x branch. Done means the provider registration information is restored after a ZooKeeper connection fluctuation and the applicable fix is available on 2.6.x.

Written by the indexing model from the issue text.