fix(guard): typespec for subject type

Author: hamir-suspect

guard/lib/guard/store/rbac_user.ex

@@ -59,7 +59,7 @@ defmodule Guard.Store.RbacUser do
     {page, users}
   end
 
-  @spec create(Ecto.UUID.t(), String.t(), String.t(), "user" | "service_account") :: :ok | :error
+  @spec create(Ecto.UUID.t(), String.t(), String.t(), String.t()) :: :ok | :error
   def create(user_id, email, name, type \\ "user") do
     subject_changeset = Subject.changeset(%Subject{}, %{id: user_id, name: name, type: type})
     user_changeset = RbacUser.changeset(%RbacUser{}, %{id: user_id, email: email})