Update Changelog

Signed-off-by: ShatilKhan <[email protected]>

Author: ShatilKhan

CHANGELOG.md

@@ -12,6 +12,7 @@
 
 - Update ouiTextSubduedColor in `next` dark theme ([#973](https://github.com/opensearch-project/oui/pull/973))
 - Add `crossInCircleEmpty` and `power` icons ([#1044](https://github.com/opensearch-project/oui/pull/1044))
+- Optimize `calc()` usage in scss files ([#1002](https://github.com/opensearch-project/oui/issues/1002))
 
 ### 🐛 Bug Fixes