Merge pull request #265606 from kabharati/patch-174

Update release-notes.md

Author: prmerger-automator[bot]

articles/postgresql/flexible-server/release-notes.md

@@ -23,6 +23,7 @@ This page provides latest news and updates regarding feature additions, engine v
 * General availability of [Server logs](./how-to-server-logs-portal.md) including Portal and CLI support.
 * General availability of UAE Central region.
 * General availability of Israel Central region.
+* World wide public preview of [long-term backup retention](concepts-backup-restore.md).
 
 ## Release: December 2023
 * Public preview of [Server logs](./how-to-server-logs-portal.md).