correct commit hash in changelog

Author: Trivo25

CHANGELOG.md

@@ -15,9 +15,9 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
     _Security_ in case of vulnerabilities.
  -->
 
-## [Unreleased](https://github.com/o1-labs/o1js/compare/250abd98d...HEAD)
+## [Unreleased](https://github.com/o1-labs/o1js/compare/3eef10d...HEAD)
 
-## [2.5.1](https://github.com/o1-labs/o1js/compare/1ad7333e9e...250abd98d) - 2025-05-27
+## [2.6.0](https://github.com/o1-labs/o1js/compare/4e23a60...3eef10d) - 2025-05-30
 
 ### Added