python3Packages.zephyr-python-api: modernize code

Update the python recipe to the new nixpkgs standard.

pkgs/development/python-modules/zephyr-python-api/default.nix

···
 buildPythonPackage rec {
   pname = "zephyr-python-api";
   version = "0.1.0";
-  format = "pyproject";
+  pyproject = true;
 
   src = fetchPypi {
     pname = "zephyr_python_api";
···
     hash = "sha256-YupGiybfhwb+I4ofr6RNBzS6LQfx5BQD/SU5nYrnqFk=";
   };
 
-  nativeBuildInputs = [ setuptools ];
+  build-system = [ setuptools ];
 
-  propagatedBuildInputs = [ requests ];
+  dependencies = [ requests ];
 
   # No tests in archive
   doCheck = false;