chore(deps): Update Terraform terraform-google-modules/project-factory/google to v18 (#803)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

test/setup/main.tf

@@ -25,7 +25,7 @@ locals {
 module "projects" {
   count   = local.num_projects
   source  = "terraform-google-modules/project-factory/google"
-  version = "~> 17.0"
+  version = "~> 18.0"
 
   name                     = "ci-tf-samples-${count.index}"
   random_project_id        = true