Edit Changelog.md

Changelog.md

 # Changelog
 
-All notable changes to this project will be documented in this file.
+## [2.15] - 2025-03-21
+
+- Upgrade orchestrator-ui-libary to 3.1.1
+- Upgrade npm dependencies to resolve vulnerabilities
+- Upgrade node to v22
+
+
 ## [2.14] - 2024-12-13
 
 -  Update references to GÉANT service IDs