3.11.16 release notes updates

(cherry picked from commit 66153fd)

Author: michaelklishin

release-notes/3.11.16.md

@@ -83,10 +83,10 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
 
 ## Dependency Upgrades
 
-None in this release.
+ * [`ra`](https://github.com/rabbitmq/ra) was upgraded [to `2.6.1`](https://github.com/rabbitmq/ra/releases)
 
 
 ## Source Code Archives
 
-To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.15.tar.xz`
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.16.tar.xz`
 instead of the source tarball produced by GitHub.