python313Packages.immutables: 0.20 -> 0.21; fix python 3.13

https://github.com/MagicStack/immutables/releases/tag/v0.21
https://github.com/MagicStack/immutables/compare/v0.20...v0.21

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

@@ -2,28 +2,31 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  setuptools,
   pytestCheckHook,
   pythonOlder,
 }:
 
 buildPythonPackage rec {
   pname = "immutables";
-  version = "0.20";
-  format = "setuptools";
+  version = "0.21";
+  pyproject = true;
 
   disabled = pythonOlder "3.8";
 
   src = fetchFromGitHub {
     owner = "MagicStack";
-    repo = pname;
+    repo = "immutables";
     rev = "refs/tags/v${version}";
-    hash = "sha256-fEECtP6WQVzwSzBYX+CbhQtzkB/1WC3OYKXk2XY//xA=";
+    hash = "sha256-wZuCZEVXzycqA/h27RIe59e2QQALem8mfb3EdjwQr9w=";
   };
 
   postPatch = ''
     rm tests/conftest.py
   '';
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   disabledTests = [