python312Packages.sphinx: disable failing test

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

@@ -1,6 +1,7 @@
 {
   lib,
   buildPythonPackage,
+  pythonAtLeast,
   pythonOlder,
   fetchFromGitHub,
   isPyPy,
@@ -116,6 +117,10 @@ buildPythonPackage rec {
       # Could not fetch remote image: http://localhost:7777/sphinx.png
       "test_copy_images"
     ]
+    ++ lib.optionals (pythonAtLeast "3.12") [
+      # https://github.com/sphinx-doc/sphinx/issues/12430
+      "test_autodoc_type_aliases"
+    ]
     ++ lib.optionals isPyPy [
       # PyPy has not __builtins__ which get asserted
       # https://doc.pypy.org/en/latest/cpython_differences.html#miscellaneous