Add release notes for 3.4.0 (#903)

Signed-off-by: opensearch-ci <[email protected]>

Author: opensearch-ci-bot

release-notes/opensearch-performance-analyzer.release-notes-3.4.0.0.md

@@ -0,0 +1,9 @@
+## Version 3.4.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 3.4.0
+
+### Enhancements
+* Resotre java min compatible to 21 and remove 24 ([#902](https://github.com/opensearch-project/performance-analyzer/pull/902))
+
+### Maintenance
+* Upgrade to JDK25 and gradle 9.2.0 ([#896](https://github.com/opensearch-project/performance-analyzer/pull/896))