changelog: sync link

Author: jcarpent

CHANGELOG.md

@@ -14,7 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Support for Python slice, tuple and list indexing for `std::vector` bindings ([#592](https://github.com/stack-of-tasks/eigenpy/pull/592))
 
 ### Fixed
-- Fix partly the support of change of API of GeneralizedEigenSolverVisitor ([]())
+- Fix partly the support of the change of API of GeneralizedEigenSolver in Eigen 5+ ([#594](https://github.com/stack-of-tasks/eigenpy/pull/594))
 
 ## [3.12.0] - 2025-08-12