python3Packages.cmudict: set updateScript & __structuredAttrs

`nix store make-content-addressed` gives the same output

pkgs/development/python-modules/cmudict/default.nix

@@ -6,6 +6,7 @@
   importlib-resources,
   poetry-core,
   pytestCheckHook,
+  nix-update-script,
 }:
 
 buildPythonPackage (finalAttrs: {
@@ -13,6 +14,8 @@ buildPythonPackage (finalAttrs: {
   version = "1.1.3";
   pyproject = true;
 
+  __structuredAttrs = true;
+
   src = fetchFromGitHub {
     owner = "prosegrinder";
     repo = "python-cmudict";
@@ -32,6 +35,10 @@ buildPythonPackage (finalAttrs: {
 
   pythonImportsCheck = [ "cmudict" ];
 
+  passthru = {
+    updateScript = nix-update-script { };
+  };
+
   meta = {
     description = "Python wrapper package for The CMU Pronouncing Dictionary data files";
     homepage = "https://github.com/prosegrinder/python-cmudict";