update changelog

Signed-off-by: Josh Romero <rmerqg@amazon.com>

Author: joshuarrrr

CHANGELOG.md

@@ -89,6 +89,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Multiple DataSource] Refactor dev tool console to use opensearch-js client to send requests ([#3544](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3544))
 - [Multiple DataSource] Present the authentication type choices in a drop-down ([#3693](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3693))
 - [Table Visualization] Move format table, consolidate types and add unit tests ([#3397](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3397))
+- Replace the use of `bluebird` in `saved_objects` plugin ([#4026](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4026))
 
 ### 🔩 Tests