fix: use force: true, not force?: true calling mix.generator

Author: zachdaniel

lib/migration_generator/migration_generator.ex

@@ -86,7 +86,7 @@ defmodule AshPostgres.MigrationGenerator do
 
           true ->
             Enum.each(files, fn {file, contents} ->
-              Mix.Generator.create_file(file, contents, force?: true)
+              Mix.Generator.create_file(file, contents, force: true)
             end)
         end
     end