python39Packages.paste: add six dependency back (#148501)

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

···
 , buildPythonPackage
 , fetchFromGitHub
 , pytestCheckHook
+, six
 }:
 
 buildPythonPackage rec {
···
     patchShebangs tests/cgiapp_data/
   '';
 
-  # propagatedBuildInputs = [ six ];
+  propagatedBuildInputs = [ six ];
 
   checkInputs = [ pytestCheckHook ];