Added Release Notes for v2.19.3 (#1331)

Signed-off-by: Vaibhav Agarwal <[email protected]>

Author: vaibhoag

release-notes/opensearch-index-management-dashboards-plugin.release-notes-2.19.3.0.md

@@ -0,0 +1,9 @@
+## Version 2.19.3.0 2025-07-22
+
+Compatible with OpenSearch 2.19.3
+
+### Maintenance
+
+* Increment version to 2.19.3.0 ([#1320](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1320))
+* Fixed CVE: babel dependencies & elliptic dependency ([#1329](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/1329))
+