Retroactively add #8328 to 3.12.0 release notes

That PR had no milestone set and this important
change has slipped through the cracks.

release-notes/3.12.0.md

@@ -340,6 +340,15 @@ This release includes all bug fixes shipped in the `3.11.x` series.
  * The `x-mqtt-dup` header will no longer be present for consumer deliveries as it wasn't used correctly.
 
 
+### Federation Plugin
+
+#### Bug Fixes
+
+ * Fixed a quorum queue-specific issue that could prevent queue federation links from making any progress.
+
+   GitHub issue: [#8328](https://github.com/rabbitmq/rabbitmq-server/pull/8328)
+
+
 ### Management Plugin
 
 #### Enhancements