treewide: setuptools_scm -> setuptools-scm

pkgs/development/python-modules/cherrypy/17.nix

@@ -1,5 +1,5 @@
 { lib, stdenv, buildPythonPackage, fetchPypi
-, setuptools_scm
+, setuptools-scm
 , cheroot, contextlib2, portend, routes, six, zc_lockfile
 , backports_unittest-mock, objgraph, pathpy, pytest, pytestcov, backports_functools_lru_cache, requests_toolbelt
 }:
@@ -18,7 +18,7 @@ buildPythonPackage rec {
     cheroot contextlib2 portend routes six zc_lockfile
   ];
 
-  nativeBuildInputs = [ setuptools_scm ];
+  nativeBuildInputs = [ setuptools-scm ];
 
   checkInputs = [
     backports_unittest-mock objgraph pathpy pytest pytestcov backports_functools_lru_cache requests_toolbelt

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

@@ -1,5 +1,5 @@
 { lib, stdenv, buildPythonPackage, fetchPypi, isPy3k
-, setuptools_scm
+, setuptools-scm
 , cheroot, portend, more-itertools, zc_lockfile, routes
 , jaraco_collections
 , objgraph, pytest, pytestcov, pathpy, requests_toolbelt, pytest-services
@@ -36,7 +36,7 @@ buildPythonPackage rec {
     })
   ];
 
-  nativeBuildInputs = [ setuptools_scm ];
+  nativeBuildInputs = [ setuptools-scm ];
 
   propagatedBuildInputs = [
     # required