Revert "python3Packages.gpytorch: mark as broken due to underlying sklearn crashes"

This reverts commit 5b56f1daaa.

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

@@ -1,6 +1,5 @@
 {
   lib,
-  stdenv,
   buildPythonPackage,
   fetchFromGitHub,
   jaxtyping,
@@ -57,9 +56,6 @@ buildPythonPackage rec {
     "test_t_matmul_matrix"
   ];
 
-  # Testing is broken on Darwin due to a `scikit-learn` issue, see https://github.com/NixOS/nixpkgs/issues/423831
-  doCheck = !stdenv.hostPlatform.isDarwin;
-
   meta = with lib; {
     description = "Highly efficient and modular implementation of Gaussian Processes, with GPU acceleration";
     homepage = "https://gpytorch.ai";