CHANGELOG: update 3.5 with etcd-io#16565

Signed-off-by: Wei Fu <fuweid89@gmail.com>

CHANGELOG/CHANGELOG-3.5.md

@@ -26,6 +26,7 @@ Previous change logs can be found at [CHANGELOG-3.4](https://github.com/etcd-io/
 - Fix [Multiple endpoints with same prefix got mixed up](https://github.com/etcd-io/etcd/pull/15939)
 - Fix [Unexpected blocking when barrier waits on a nonexistent key](https://github.com/etcd-io/etcd/pull/16188)
 - Fix [Reset auth token when failing to authenticate due to auth being disabled](https://github.com/etcd-io/etcd/pull/16241)
+- Fix [panic in etcd validate secure endpoints](https://github.com/etcd-io/etcd/pull/16565)
 
 ### Dependencies
 - Compile binaries using [go 1.20.8](https://github.com/etcd-io/etcd/pull/16555).