Adds changelog

Signed-off-by: Bandini Bhopi <bandinib@amazon.com>

CHANGELOG.md

@@ -27,6 +27,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Multiple Datasource] Expose a few properties for customize the appearance of the data source selector component ([#6057](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6057))
 - [Multiple Datasource] Create data source menu component able to be mount to nav bar ([#6082](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6082))
 - [Multiple Datasource] Handle form values(request payload) if the selected type is available in the authentication registry ([#6049](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6049))
+- [Multiple Datasource] Adds a session token to AWS credentials ([#6103](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6103))
 - [Multiple Datasource] Add Vega support to MDS by specifying a data source name in the Vega spec ([#5975](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5975))
 - [Workspace] Consume workspace id in saved object client ([#6014](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6014))