update changelog

Signed-off-by: xil <fridalu66@gmail.com>

Author: lucy66hw

CHANGELOG.md

@@ -9,7 +9,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
  - Fix simplifySingleMapSchema to generate named wrapper schemas. ([#406](https://github.com/opensearch-project/opensearch-protobufs/pull/406))
  - Change vendorExtension protobuf type handling to use protobuf type instead of openApi type ([#409](https://github.com/opensearch-project/opensearch-protobufs/pull/409))
  - Normalize mixed oneOf patterns ([#416](https://github.com/opensearch-project/opensearch-protobufs/pull/416))
- - Add hoistAnyOfFromAllOf transformation to prevent protobuf generator from flattening allOf+anyOf structures
+ - Add hoistAnyOfFromAllOf transformation to prevent protobuf generator from flattening allOf+anyOf structures ([#425](https://github.com/opensearch-project/opensearch-protobufs/pull/425))
 ### Removed
 
 ### Fixed