adds release notes for potgresql 17 binaries

Author: ishan1729

content/en/docs/releasenotes/deployment/mendix-cloud/2026.md

@@ -7,6 +7,16 @@ weight: 1
 ---
 ## June 2026
 
+### June 9, 2026
+
+#### Improvements
+
+Mendix Cloud database backups are now created with `pg_dump` version `1.16`. This version is shipped with PostgreSQL since September 2024 (PostgreSQL 17).
+The side effect is that it is not possible to restore these PostgreSQL backups using a `pg_restore` version below 1.16 (PostgreSQL < 17).
+The error that you will receive is pg_restore: [archiver] unsupported version (1.16) in the file header.
+To resolve this issue, upgrade your software to a version that includes newer versions of `pg_dump` and `pg_restore`.
+Please note that the backups taken on Mendix Cloud before 9th June will continue to work as expected after your local PostgresSQL binaries are updated to newer versions.
+
 ### June 7, 2026
 
 #### Bug Fixes