Update changelog

Signed-off-by: dependabot[bot] <[email protected]>

Author: andrross

Diff for: CHANGELOG.md

@@ -1,4 +1,10 @@
 # CHANGELOG
+
+## [Unreleased 2.x]
+
+### Dependencies
+
+- Bump `com.google.api:gax` from 2.35.0 to 2.62.0 ([#17465](https://github.com/opensearch-project/OpenSearch/pull/17465))
 All notable changes to this project are documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). See the [CONTRIBUTING guide](./CONTRIBUTING.md#Changelog) for instructions on how to add changelog entries.