fix: More compatibility fixes for Terraform v0.13 and aws v3 (#976)

Additional support for Terraform v0.13 and aws v3!
- The update to the vpc module in examples was, strictly speaking, unnecessary but it adds the terraform block with supported versions.
- Update for iam module in the example was very necessary to support new versions
- Workaround for "Provider produced inconsistent final plan" when creating ASGs at the same time as the cluster. See  https://github.com/terraform-providers/terraform-provider-aws/issues/14085 for full details.
- Blacklist 0.13.0 as it was too strict when migrating from aws v2 to v3 about dropped attributes.

workers.tf

@@ -102,31 +102,38 @@ resource "aws_autoscaling_group" "workers" {
     }
   }
 
-  tags = concat(
-    [
-      {
-        "key"                 = "Name"
-        "value"               = "${aws_eks_cluster.this[0].name}-${lookup(var.worker_groups[count.index], "name", count.index)}-eks_asg"
-        "propagate_at_launch" = true
-      },
-      {
-        "key"                 = "kubernetes.io/cluster/${aws_eks_cluster.this[0].name}"
-        "value"               = "owned"
-        "propagate_at_launch" = true
-      },
-      {
-        "key"                 = "k8s.io/cluster/${aws_eks_cluster.this[0].name}"
-        "value"               = "owned"
-        "propagate_at_launch" = true
-      },
-    ],
-    local.asg_tags,
-    lookup(
-      var.worker_groups[count.index],
-      "tags",
-      local.workers_group_defaults["tags"]
+  dynamic "tag" {
+    for_each = concat(
+      [
+        {
+          "key"                 = "Name"
+          "value"               = "${aws_eks_cluster.this[0].name}-${lookup(var.worker_groups[count.index], "name", count.index)}-eks_asg"
+          "propagate_at_launch" = true
+        },
+        {
+          "key"                 = "kubernetes.io/cluster/${aws_eks_cluster.this[0].name}"
+          "value"               = "owned"
+          "propagate_at_launch" = true
+        },
+        {
+          "key"                 = "k8s.io/cluster/${aws_eks_cluster.this[0].name}"
+          "value"               = "owned"
+          "propagate_at_launch" = true
+        },
+      ],
+      local.asg_tags,
+      lookup(
+        var.worker_groups[count.index],
+        "tags",
+        local.workers_group_defaults["tags"]
+      )
     )
-  )
+    content {
+      key                 = tag.value.key
+      value               = tag.value.value
+      propagate_at_launch = tag.value.propagate_at_launch
+    }
+  }
 
   lifecycle {
     create_before_destroy = true