python312Packages.chai: fix python 3.12 build

assertXYZ methods with the "s" suffix were removed in python 3.12, patch until fixed upstream

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

@@ -10,6 +10,14 @@ buildPythonPackage rec {
     sha256 = "ff8d2b6855f660cd23cd5ec79bd10264d39f24f6235773331b48e7fcd637d6cc";
   };
 
+  postPatch = ''
+    # python 3.12 compatibility
+    substituteInPlace tests/*.py \
+      --replace "assertEquals" "assertEqual" \
+      --replace "assertNotEquals" "assertNotEqual" \
+      --replace "assert_equals" "assert_equal"
+  '';
+
   meta = with lib; {
     description = "Mocking, stubbing and spying framework for python";
   };