fix 301-hub-spoke

quickstart/301-hub-spoke/main.tf

@@ -5,7 +5,7 @@ terraform {
   required_providers {
     azurerm = {
       source  = "hashicorp/azurerm"
-      version = "~>2.0"
+      version = "~> 3.0"
     }
   }
 }
@@ -13,3 +13,12 @@ terraform {
 provider "azurerm" {
   features {}
 }
+
+resource "random_password" "password" {
+  count = var.password == null ? 1 : 0
+  length = 20
+}
+
+locals {
+  password = try(random_password.password[0].result, var.password)
+}