release-notes: add missing versions (#862)

Signed-off-by: Christian Berendt <[email protected]>

Author: berendt

docs/release-notes/osism-9.md

@@ -8,10 +8,26 @@ Instructions for the upgrade can be found in the [Upgrade Guide](../guides/upgra
 
 | Release                  | Release Date        |
 |:-------------------------|:--------------------|
+| [9.3.1](#931-20250920)   | 20. September 2025  |
+| [9.3.0](#930-20250917)   | 17. September 2025  |
 | [9.2.0](#920-20250711)   | 11. July 2025       |
 | [9.1.0](#910-20250530)   | 30. May 2025        |
 | [9.0.0](#900-20250408)   | 8. April 2025       |
 
+## 9.3.1 (20250920)
+
+## 9.3.0 (20250917)
+
+* All OpenStack service images have been rebuilt. An upgrade of OpenStack services is recommended.
+
+* The infrastructure service images (MariaDB, RabbitMQ, ..) have been rebuilt. An upgrade is recommended.
+
+* The network service images (OVN, OVS) have been rebuilt. An upgrade is recommended.
+
+* The monitoring service images (Prometheus & all Prometheus exporters) have been rebuilt. An upgrade is recommended.
+
+* The logging service images (OpenSearch, Fluentd) have been rebuilt. An upgrade is recommended.
+
 ## 9.2.0 (20250711)
 
 * All OpenStack service images have been rebuilt. An upgrade of OpenStack services is recommended.