python312Packages.curio: fix build

Upstream has no released version with Python 3.12 supported yet, but a
patch was already merged, which works fine.

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

···
 { lib
 , buildPythonPackage
 , fetchPypi
+, fetchpatch
 , isPy3k
 , pytestCheckHook
 , sphinx
···
     inherit pname version;
     hash = "sha256-VipYbbICFrp9K+gmPeuesHnlYEj5uJBtEdX0WqgcUkc=";
   };
+
+  patches = [
+    (fetchpatch {
+      # Add support for Python 3.12
+      # https://github.com/dabeaz/curio/pull/363
+      url = "https://github.com/dabeaz/curio/commit/a5590bb04de3f1f201fd1fd0ce9cfe5825db80ac.patch";
+      hash = "sha256-dwatxLOPAWLQSyNqJvkx6Cbl327tX9OpZXM5aaDX58I=";
+    })
+  ];
 
   nativeCheckInputs = [
     pytestCheckHook