nox: add missing 'setuptools' to propagatedBuildInputs

As a side-effect of f7e28bf5d8, the build
no longer propagated 'setuptools', which is a run-time dependency. See
https://github.com/NixOS/nixpkgs/pull/68314 for further details.

pkgs/tools/package-management/nox/default.nix

@@ -19,6 +19,7 @@ python3Packages.buildPythonApplication rec {
       click
       requests
       characteristic
+      setuptools
     ];
 
   meta = {