python313Packages.pysmartdl: fix tests (#404507)

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

···
 
   nativeCheckInputs = [ pytestCheckHook ];
 
+  # https://docs.python.org/3/whatsnew/3.13.html#unittest
+  preCheck = ''
+    substituteInPlace test/test_pySmartDL.py \
+      --replace-fail 'unittest.makeSuite(' 'unittest.TestLoader().loadTestsFromTestCase('
+  '';
   disabledTests = [
     # touch the network
     "test_basic_auth"