correct type

gcp-region/main.tf

@@ -697,13 +697,11 @@ locals {
 }
 
 data "coder_parameter" "region" {
-  type         = "list(string)"
   name         = "gcp_region"
   display_name = var.display_name
   description  = var.description
   icon         = "/icon/gcp.svg"
   mutable      = var.mutable
-
   dynamic "option" {
     for_each = { for k, v in local.zones : k => v if(contains(var.default, k) || contains(var.default, "all")) && (!var.gpu_only || v.has_gpu) }
     content {