Update 3.9.10 release notes

(cherry picked from commit 262063e)

Author: michaelklishin

release-notes/3.9.10.md

@@ -46,7 +46,7 @@ Contributors are encouraged to update them together with their changes. This hel
 
 ## Dependency Upgrades
 
-None in this release.
+* Ra was [upgraded to `2.0.3`](https://github.com/rabbitmq/ra/compare/v2.0.2...v2.0.3)
 
 
 ## Source Code Archives