Add release notes 4.12

Add release notes 4.12

Author: smcvb

docs/reference/modules/ROOT/pages/release-notes.adoc

@@ -4,9 +4,15 @@
 You can find the release notes for the Jobrunr Pro Extension for version 4.10.0 and up, below.
 For earlier releases, please go to the link:https://legacydocs.axoniq.io/reference-guide/release-notes/rn-extensions/rn-jgroups[legacy documentation].
 
+== Release 4.12
+
+Upgrades the JGroups Extension to be compatible with Axon Framework 4.12.0, and updates various dependencies.
+
+See the link:https://github.com/AxonFramework/extension-jgroups/releases/tag/axon-jgroups-4.12.0[GitHub release notes] for an exhaustive list of all changes.
+
 == Release 4.11
 
-Upgrades the JGroups Extension to be compatible with Axon Framework 4.10.0, and updates various dependencies.
+Upgrades the JGroups Extension to be compatible with Axon Framework 4.11.0, and updates various dependencies.
 
 See the link:https://github.com/AxonFramework/extension-jgroups/releases/tag/axon-jgroups-4.11.0[GitHub release notes] for an exhaustive list of all changes.