Updated release date

Author: lvukadinovic-ib

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to the library will be documented in this file.
 The format of the file is based on [Keep a Changelog](http://keepachangelog.com/)
 and this library adheres to [Semantic Versioning](http://semver.org/) as mentioned in [README.md][readme] file.
 
-## [ [5.1.0](https://github.com/infobip/infobip-api-python-client/releases/tag/5.1.0) ] - 2025-03-20
+## [ [5.1.0](https://github.com/infobip/infobip-api-python-client/releases/tag/5.1.0) ] - 2025-03-21
 
 ⚠️ **IMPORTANT NOTE:** This release contains breaking changes.
 All changes, including breaking changes, are addressed and explained in the list bellow.