chore: create branch for release V6.0.x and updated changelog

CHANGELOG.md

@@ -5,7 +5,8 @@ All notable changes to this project will be 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).
 
-## Unreleased
+## V6.0.x - 2024-12-27
+
 
 ### x/data
 
@@ -20,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [v5.1.2](https://github.com/regen-network/regen-ledger/releases/tag/v5.1.2) - 2023-06-28
 
 ### General
+- [#2162](https://github.com/regen-network/regen-ledger/pull/2162) Upgrade all modules to cosmos-sdk v0.47.13
 
 #### Changed