release: Update CHANGELOG.md for 3.6.0

Author: jorisv

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+## [3.6.0] - 2025-04-28
+
 ### Fixed
 - Fix getters for models and data in `VisualizerPythonVisitor` ([#2647](https://github.com/stack-of-tasks/pinocchio/pull/2647))
 - Fix `pinocchio::cholesky::Mv` build with `CppAd` scalar ([#2659](https://github.com/stack-of-tasks/pinocchio/pull/2659))
@@ -1140,7 +1142,8 @@ The model can either be parsed from a URDF format or be created by appendending
         • Fixed (concatenation of two consecutive bodies)
 
 
-[Unreleased]: https://github.com/stack-of-tasks/pinocchio/compare/v3.5.0...HEAD
+[Unreleased]: https://github.com/stack-of-tasks/pinocchio/compare/v3.6.0...HEAD
+[3.6.0]: https://github.com/stack-of-tasks/pinocchio/compare/v3.5.0...v3.6.0
 [3.5.0]: https://github.com/stack-of-tasks/pinocchio/compare/v3.4.0...v3.5.0
 [3.4.0]: https://github.com/stack-of-tasks/pinocchio/compare/v3.3.1...v3.4.0
 [3.3.1]: https://github.com/stack-of-tasks/pinocchio/compare/v3.3.0...v3.3.1