python3Packages.cfgv: modernize

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

@@ -1,17 +1,15 @@
 {
   lib,
   buildPythonPackage,
-  pythonOlder,
   fetchFromGitHub,
+  setuptools,
   pytestCheckHook,
 }:
 
 buildPythonPackage rec {
   pname = "cfgv";
   version = "3.5.0";
-  format = "setuptools";
-
-  disabled = pythonOlder "3.8";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "asottile";
@@ -20,14 +18,20 @@ buildPythonPackage rec {
     hash = "sha256-ccCalTNVEHvh1gKhQgceD/yAScIEQy3ZKqndoWs7FQQ=";
   };
 
-  nativeCheckInputs = [ pytestCheckHook ];
+  build-system = [
+    setuptools
+  ];
+
+  nativeCheckInputs = [
+    pytestCheckHook
+  ];
 
   pythonImportsCheck = [ "cfgv" ];
 
-  meta = with lib; {
+  meta = {
     description = "Validate configuration and produce human readable error messages";
     homepage = "https://github.com/asottile/cfgv";
-    license = licenses.mit;
+    license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ nickcao ];
   };
 }