add changelog entry

Author: nim65s

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Fix linkage of Boost.Serialization on Windows ([#2400](https://github.com/stack-of-tasks/pinocchio/pull/2400))
 - Fix mjcf parser appending of inertias at root joint ([#2403](https://github.com/stack-of-tasks/pinocchio/pull/2403))
+- Fix unit tests with GCC 13.3 ([#2406](https://github.com/stack-of-tasks/pinocchio/pull/2416)
 
 ## [3.2.0] - 2024-08-27