release: Update CHANGELOG.md for 2.7.0

Author: jorisv

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+## [2.7.0] - 2024-01-23
+
 ### Added
 - Add `GeometryObject::meshMaterial` attribute ([#2084](https://github.com/stack-of-tasks/pinocchio/issues/2084))
 
@@ -825,7 +827,8 @@ 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/v2.6.21...HEAD
+[Unreleased]: https://github.com/stack-of-tasks/pinocchio/compare/v2.7.0...HEAD
+[2.7.0]: https://github.com/stack-of-tasks/pinocchio/compare/v2.6.21...v2.7.0
 [2.6.21]: https://github.com/stack-of-tasks/pinocchio/compare/v2.6.20...v2.6.21
 [2.6.20]: https://github.com/stack-of-tasks/pinocchio/compare/v2.6.19...v2.6.20
 [2.6.19]: https://github.com/stack-of-tasks/pinocchio/compare/v2.6.18...v2.6.19