python3Packages.pooch: update dependencies

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

···
 , buildPythonPackage
 , isPy27
 , fetchPypi
+, setuptools-scm
 , pytestCheckHook
 , packaging
 , appdirs
···
     inherit pname version;
     sha256 = "f827e79ab51b21a8964a4b1ea8972aa4a1079cb9c1ff8e9ec61893eb7dab50cb";
   };
+
+  nativeBuildInputs = [ setuptools-scm ];
 
   propagatedBuildInputs = [ packaging appdirs requests ];