[Event Hubs] Prepare March release (Azure#25114)

Author: deyaaeldeen

sdk/eventhub/event-hubs/CHANGELOG.md

@@ -1,14 +1,10 @@
 # Release History
 
-## 5.9.0 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
+## 5.9.0 (2023-03-07)
 
 ### Bugs Fixed
 
-- Fixing a bug where events were not always received in order [#23993](https://github.com/Azure/azure-sdk-for-js/issues/23993).
+- Fixing a bug where events were not always received in order [[#23993]](https://github.com/Azure/azure-sdk-for-js/issues/23993).
 
 ### Other Changes