chore: update example module sources and versions

- Update module source. This should prevent the source from getting
  rewritten when tests are run locally
- Add missing version spec to match other modules

Author: wyardley

examples/autopilot_private_firewalls/main.tf

@@ -33,7 +33,9 @@ provider "kubernetes" {
 }
 
 module "gke" {
-  source                            = "../../modules/beta-autopilot-private-cluster/"
+  source  = "terraform-google-modules/kubernetes-engine/google//modules/beta-autopilot-private-cluster/"
+  version = "~> 33.0"
+
   project_id                        = var.project_id
   name                              = "${local.cluster_type}-cluster"
   regional                          = true

examples/simple_fleet_app_operator_permissions/main.tf

@@ -35,7 +35,8 @@ resource "google_gke_hub_scope" "scope" {
 
 # Grant permissions to the app operator to work with the Fleet Scope.
 module "permissions" {
-  source = "../../modules/fleet-app-operator-permissions"
+  source  = "terraform-google-modules/kubernetes-engine/google//modules/fleet-app-operator-permissions"
+  version = "~> 33.0"
 
   fleet_project_id = var.fleet_project_id
   scope_id         = google_gke_hub_scope.scope.scope_id