rename iam additive variable in project module

tests/modules/project/fixture/main.tf

@@ -21,7 +21,7 @@ module "test" {
   auto_create_network   = var.auto_create_network
   custom_roles          = var.custom_roles
   iam_members           = var.iam_members
-  iam_additive_bindings = var.iam_additive_bindings
+  iam_additive          = var.iam_additive
   labels                = var.labels
   lien_reason           = var.lien_reason
   oslogin               = var.oslogin

tests/modules/project/fixture/variables.tf

@@ -29,7 +29,7 @@ variable "iam_members" {
   default = {}
 }
 
-variable "iam_additive_bindings" {
+variable "iam_additive" {
   type    = map(list(string))
   default = {}
 }