Add to changelog

Author: hgreebe

CHANGELOG.md

@@ -7,6 +7,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 ------
 
 **CHANGES**
+- Upgrade Python to 3.12.8 (from 3.9.20).
 - On Ubuntu 22.04, install the Nvidia driver with the same compiler version used to compile the kernel.
 - Upgrade `aws-cfn-bootstrap` to version 2.0-32.
 - Upgrade amazon-efs-utils to version 2.1.0.