changelog: add item to cover the fix for double barrier running into stack overflow error
@@ -16,6 +16,7 @@ Previous change logs can be found at [CHANGELOG-3.4](https://github.com/etcd-io/
### Package `clientv3`
- Fix [Add backoff before retry when watch stream returns unavailable](https://github.com/etcd-io/etcd/pull/14582).
+- Fix [stack overflow error in double barrier](https://github.com/etcd-io/etcd/pull/14658)
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