python3Packages.volatile: migrate to pyproject

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

@@ -3,12 +3,13 @@
   buildPythonPackage,
   fetchFromGitHub,
   pytestCheckHook,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "volatile";
   version = "2.1.0";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "mbr";
@@ -17,6 +18,8 @@ buildPythonPackage rec {
     hash = "sha256-TYUvr0bscM/FaPk9oiF4Ob7HdKa2HlbpEFmaPfh4ir0=";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   pythonImportsCheck = [ "volatile" ];