Merge pull request #10081 from cloudamqp/fix_3_11_26_rel_notes

Update 3.11.26 release notes

Author: michaelklishin

release-notes/3.11.26.md

@@ -43,18 +43,6 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
    GitHub issue: [#9955](https://github.com/rabbitmq/rabbitmq-server/pull/9955)
 
 
-### Shovel Plugin
-
-#### Bug Fixes
-
- * Shovels on `3.12.8` nodes failed during a rolling cluster upgrade due to internal
-   identifier format changes.
-
-   Starting with this release, both old and new formats are supported for upgrade safety.
-
-   GitHub issue: [#9894](https://github.com/rabbitmq/rabbitmq-server/pull/9894)
-
-
 ### Grafana Dashboard
 
 #### Enhancements