added release notes for 3.1 (#1541)

* added release notes for 3.1

Signed-off-by: KashKondaka <37753523+KashKondaka@users.noreply.github.com>

* Update opensearch-security-analytics.release-notes-3.1.0.0.md

Signed-off-by: KashKondaka <37753523+KashKondaka@users.noreply.github.com>

---------

Signed-off-by: KashKondaka <37753523+KashKondaka@users.noreply.github.com>

Author: KashKondaka

release-notes/opensearch-security-analytics.release-notes-3.1.0.0.md

@@ -0,0 +1,7 @@
+## Version 3.1.0.0 2025-06-17
+
+Compatible with OpenSearch 3.1.0
+
+### Maintenance
+* Switch guava deps from compileOnly to implementation ([#1530](https://github.com/opensearch-project/security-analytics/pull/1530))
+* Increment version to 3.1.0-SNAPSHOT ([#1517](https://github.com/opensearch-project/security-analytics/pull/1517))