Add changelog update for shared storage type efs bug fix (#2753)

Author: dreambeyondorange

CHANGELOG.md

@@ -15,6 +15,9 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 **CHANGES**
 - Upgrade Slurm to 23.11.7 (from 23.11.4).
 
+**BUG FIXES**
+- Fix issue with `SharedStorageType: Efs` not bootstrapping on ARM instances.
+
 3.9.1
 ------