slicer: fix build

(cherry picked from commit 182c8be43317221676de695fa76dd680e4bc7ee9)

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

···
 , pytestCheckHook
 , pandas
 , pytorch
+, scipy
 }:
 
 buildPythonPackage rec {
···
     sha256 = "f5d5f7b45f98d155b9c0ba6554fa9770c6b26d5793a3e77a1030fb56910ebeec";
   };
 
-  checkInputs = [ pytestCheckHook pandas pytorch ];
+  checkInputs = [ pytestCheckHook pandas pytorch scipy ];
 
   meta = with lib; {
     description = "Wraps tensor-like objects and provides a uniform slicing interface via __getitem__";