treewide: setuptools_scm -> setuptools-scm

pkgs/development/python-modules/pytest/4.nix

@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, pythonOlder, fetchPypi, attrs, hypothesis, py
-, setuptools_scm, setuptools, six, pluggy, funcsigs, isPy3k, more-itertools
+, setuptools-scm, setuptools, six, pluggy, funcsigs, isPy3k, more-itertools
 , atomicwrites, mock, writeText, pathlib2, wcwidth, packaging, isPyPy
 }:
 buildPythonPackage rec {
@@ -12,7 +12,7 @@ buildPythonPackage rec {
   };
 
   checkInputs = [ hypothesis mock ];
-  buildInputs = [ setuptools_scm ];
+  buildInputs = [ setuptools-scm ];
   propagatedBuildInputs = [ attrs py setuptools six pluggy more-itertools atomicwrites wcwidth packaging ]
     ++ lib.optionals (!isPy3k) [ funcsigs ]
     ++ lib.optionals (pythonOlder "3.6") [ pathlib2 ];

pkgs/development/python-modules/pytest/5.nix

@@ -12,7 +12,7 @@
 , pygments
 , python
 , setuptools
-, setuptools_scm
+, setuptools-scm
 , six
 , toml
 , wcwidth
@@ -31,7 +31,7 @@ buildPythonPackage rec {
   };
 
   checkInputs = [ hypothesis pygments ];
-  nativeBuildInputs = [ setuptools_scm ];
+  nativeBuildInputs = [ setuptools-scm ];
   propagatedBuildInputs = [
     atomicwrites
     attrs