doc: update CHANGELOG

Author: XinyuCRO

CHANGELOG.md

@@ -12,6 +12,7 @@
 * [#1779](https://github.com/crypto-org-chain/cronos/pull/1779) Upgrade rocksdb to `v9.11.2`.
 * [#1824](https://github.com/crypto-org-chain/cronos/pull/1824) Rework on github actions.
 * [#1826](https://github.com/crypto-org-chain/cronos/pull/1826) Update linter and tidy up code.
+* [#1807](https://github.com/crypto-org-chain/cronos/pull/1807) Update go-ethereum version to [v1.15.11](https://github.com/ethereum/go-ethereum/releases/tag/v1.15.11).
 
 *Jun 20, 2025*