Update CHANGELOG.md

Author: nabil-Tounarti

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file.
 
-## [[8.6.0]](https://github.com/iExecBlockchainComputing/iexec-blockchain-adapter-api/releases/tag/vNEXT) 2024-12-20
+## [[8.6.0]](https://github.com/iExecBlockchainComputing/iexec-blockchain-adapter-api/releases/tag/v8.6.0) 2024-12-20
 
 ### Bug Fixes