Enable quokka with :module_directives rule

lib/mix/tasks/music_library/prod/db_migrate.ex

@@ -1,5 +1,4 @@
 defmodule Mix.Tasks.MusicLibrary.Prod.DbMigrate do
-  use Mix.Task
   @shortdoc "Run migrations on the production database"
   @moduledoc """
   Run migrations on the production database.
@@ -7,6 +6,8 @@ defmodule Mix.Tasks.MusicLibrary.Prod.DbMigrate do
   Requires the `flyctl` CLI to be installed and authenticated.
   """
 
+  use Mix.Task
+
   import Mix.Tasks.MusicLibrary.Prod.Helpers
 
   @impl Mix.Task