chore: update changelog from unreleased to v30.0.0 (#9466) (#9468)

(cherry picked from commit 9e99ce5)

Co-authored-by: Supanat <supanat.ptk@gmail.com>

Author: mergify[bot]

CHANGELOG.md

@@ -42,6 +42,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## v30.0.0
+
 ### State Breaking
 
 * [#9355](https://github.com/osmosis-labs/osmosis/pull/9355) chore: bump go version to v1.23