Add release notes for 2.19.6

Signed-off-by: opensearch-ci-bot <opensearch-infra@amazon.com>

Author: opensearch-ci-bot

release-notes/opensearch-performance-analyzer.release-notes-2.19.6.0.md

@@ -0,0 +1,15 @@
+## Version 2.19.6 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 2.19.6
+
+### Enhancements
+
+* Update maven2 mirror repository URL order ([#959](https://github.com/opensearch-project/performance-analyzer/pull/959))
+
+### Bug Fixes
+
+* Upgrade vulnerable dependencies to resolve CVEs (Bouncy Castle, plexus-utils, Netty, Jackson) ([#953](https://github.com/opensearch-project/performance-analyzer/pull/953))
+
+### Documentation
+
+* Add release notes for v2.19.5 ([#922](https://github.com/opensearch-project/performance-analyzer/pull/922))