release: Update CHANGELOG.md for 0.9.0

Author: ManifoldFR

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.9.0] - 2024-10-14
+
 ### Fixed
 
 * Ask for Pinocchio 3.0.0 (which exists, not 2.9.1)
@@ -133,7 +135,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * This is the first release of `proxsuite-nlp`. This library is a joint effort between LAAS-CNRS and INRIA, and will be maintained and expanded in the future. Please provide constructive feedback and contribute!
 
-[Unreleased]: https://github.com/Simple-Robotics/proxsuite-nlp/compare/v0.8.0...HEAD
+[Unreleased]: https://github.com/Simple-Robotics/proxsuite-nlp/compare/v0.9.0...HEAD
+[0.9.0]: https://github.com/Simple-Robotics/proxsuite-nlp/compare/v0.8.0...v0.9.0
 [0.8.0]: https://github.com/Simple-Robotics/proxsuite-nlp/compare/v0.7.1...v0.8.0
 [0.7.1]: https://github.com/Simple-Robotics/proxsuite-nlp/compare/v0.7.0...v0.7.1
 [0.7.0]: https://github.com/Simple-Robotics/proxsuite-nlp/compare/v0.6.1...v0.7.0