Add release notes for 1.3.9 (#2539) (#2540)

* Add release notes for 1.3.9

Signed-off-by: Ryan Liang <jiallian@amazon.com>
(cherry picked from commit a5c73f9)

Co-authored-by: Ryan Liang <109499885+RyanL1997@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

release-notes/opensearch-security.release-notes-1.3.9.0.md

@@ -0,0 +1,15 @@
+## 2023-03-16 Version 1.3.9.0
+
+Compatible with OpenSearch 1.3.9
+
+### Enhancement
+
+* Flatten response times ([#2471](https://github.com/opensearch-project/security/pull/2471))
+* Add auto github release workflow ([#2450](https://github.com/opensearch-project/security/pull/2450))
+* Adding index template permissions to kibana_server role ([2503](https://github.com/opensearch-project/security/pull/2503))
+* Clock skew tolerance for oidc token validation ([2482](https://github.com/opensearch-project/security/pull/2482))
+
+### Maintenance
+
+* Update kafka client to 3.4.0 ([#2484](https://github.com/opensearch-project/security/pull/2484))
+* Fix the format of the codeowners file ([#2469](https://github.com/opensearch-project/security/pull/2469))