Updated CHANGELOG.md for version v2.2.3

Author: DariuszDepta

CHANGELOG.md

@@ -6,6 +6,16 @@ The format is based on [Keep a Changelog], and this project adheres to [Semantic
 
 (empty)
 
+## [2.2.3] - 2025-12-19
+
+### Changed
+
+- Backport GitHub actions to version 2.2.2 ([#2580]).
+- Unified maintainers/developers tools ([#2582]).
+
+[#2580]: https://github.com/CosmWasm/cosmwasm/pull/2580
+[#2582]: https://github.com/CosmWasm/cosmwasm/pull/2582
+
 ## [2.2.2] - 2025-03-05
 
 ### Changed
@@ -986,7 +996,8 @@ The CHANGELOG for versions before 1.0.0 was moved to
 [CHANGELOG-pre1.0.0.md](./CHANGELOG-pre1.0.0.md).
 
 
-[unreleased]: https://github.com/CosmWasm/cosmwasm/compare/v2.2.2...HEAD
+[unreleased]: https://github.com/CosmWasm/cosmwasm/compare/v2.2.3...HEAD
+[2.2.3]: https://github.com/CosmWasm/cosmwasm/compare/v2.2.2...v2.2.3
 [2.2.2]: https://github.com/CosmWasm/cosmwasm/compare/v2.2.1...v2.2.2
 [2.2.1]: https://github.com/CosmWasm/cosmwasm/compare/v2.2.0...v2.2.1
 [2.2.0]: https://github.com/CosmWasm/cosmwasm/compare/v2.1.3...v2.2.0