kvdb: bump etcd to v3.5.7

docs/release-notes/release-notes-0.16.0.md

@@ -338,7 +338,11 @@ Keysend](https://github.com/lightningnetwork/lnd/pull/7334).
 * [Add a sqlite backend 
   option](https://github.com/lightningnetwork/lnd/pull/7251) to the kvdb 
   package.
- 
+
+* [Bumped etcd dependencies to
+  3.5.7](https://github.com/lightningnetwork/lnd/pull/7353) to resolve linking
+  issues with outdated dependencies.
+
 ## Pathfinding
 
 * [Pathfinding takes capacity of edges into account to improve success