Update CHANGELOG.md for Release v0.21.2

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+## [0.21.2] - 2024-08-20
+
 ### Fixed
 
 -   `east build` command silently dropped the board-related .conf files when build types 
@@ -589,7 +591,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 -   Docker scripts for building and running docker containers, for development
     purposes.
 
-[Unreleased]: https://github.com/IRNAS/irnas-east-software/compare/v0.21.1...HEAD
+[Unreleased]: https://github.com/IRNAS/irnas-east-software/compare/v0.21.2...HEAD
+
+[0.21.2]: https://github.com/IRNAS/irnas-east-software/compare/v0.21.1...v0.21.2
 
 [0.21.1]: https://github.com/IRNAS/irnas-east-software/compare/v0.21.0...v0.21.1