CHANGELOG/CHANGELOG-3.4.md: update changelog

In this commit, we update the changelog for gRPC metadata printing in release 3.4 which is mainly a backport from PR etcd-io#18311. Signed-off-by: Mohamed Awnallah <[email protected]>
mohamedawnallah · Jul 14, 2024 · 4bf1861 · 4bf1861
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@@ -6,6 +6,9 @@ Previous change logs can be found at [CHANGELOG-3.3](https://github.com/etcd-io/
 
 ## v3.4.34 (TBD)
 
+### Package clientv3
+- [Print gRPC metadata in guaranteed order using the official go fmt pkg](https://github.com/etcd-io/etcd/pull/18311).
+
 ### Dependencies
 - Compile binaries using go [1.21.12](https://github.com/etcd-io/etcd/pull/18272).