docs: Replace cluster autoscaler/node termination handler example with Karpenter (#1994)

examples/karpenter/versions.tf

@@ -0,0 +1,18 @@
+terraform {
+  required_version = ">= 0.13.1"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 3.72"
+    }
+    helm = {
+      source  = "hashicorp/helm"
+      version = ">= 2.4"
+    }
+    kubectl = {
+      source  = "gavinbunney/kubectl"
+      version = ">= 1.14"
+    }
+  }
+}