python3Packages.baseline: migrate to pyproject

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

@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  setuptools,
   isPy3k,
   pytestCheckHook,
 }:
@@ -9,7 +10,7 @@
 buildPythonPackage {
   pname = "baseline";
   version = "1.2.1";
-  format = "setuptools";
+  pyproject = true;
   disabled = !isPy3k;
 
   src = fetchFromGitHub {
@@ -19,6 +20,8 @@ buildPythonPackage {
     sha256 = "0qjg46ipyfjflvjqzqr5p7iylwwqn2mhhrq952d01vi8wvfds10d";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   meta = {