chore: update meshstack provider in aks starterkit

Author: malhussan

modules/aks/starterkit/buildingblock/versions.tf

@@ -2,7 +2,7 @@ terraform {
   required_providers {
     meshstack = {
       source  = "meshcloud/meshstack"
-      version = "0.9.0"
+      version = "0.15.0"
     }
   }
 }