python3Packages.toposort: add setuptools to nativeBuildInputs

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

···
 { lib
 , buildPythonPackage
 , fetchPypi
+, setuptools
 }:
 
 buildPythonPackage rec {
···
     inherit pname version;
     sha256 = "sha256-3cIYLEKRKkQFEb1/9dPmocq8Osy8Z0oyWMjEHL+7ISU=";
   };
+
+  nativeBuildInputs = [
+    setuptools
+  ];
 
   pythonImportsCheck = [
     "toposort"