fix: Update the instance_refresh example to use a count when creating

the aws_autoscaling_lifecycle_hook.

examples/instance_refresh/main.tf

@@ -217,10 +217,9 @@ resource "helm_release" "aws_node_termination_handler" {
 # ensures that node termination does not require the lifecycle action to be completed,
 # and thus allows the ASG to be destroyed cleanly.
 resource "aws_autoscaling_lifecycle_hook" "aws_node_termination_handler" {
-  for_each = toset(module.eks.workers_asg_names)
-
+  count                  = length(module.eks.workers_asg_names)
   name                   = "aws-node-termination-handler"
-  autoscaling_group_name = each.value
+  autoscaling_group_name = module.eks.workers_asg_names[count.index]
   lifecycle_transition   = "autoscaling:EC2_INSTANCE_TERMINATING"
   heartbeat_timeout      = 300
   default_result         = "CONTINUE"