melpaStablePackages.graphene: mark broken

pkgs/applications/editors/emacs-modes/melpa-stable-packages.nix

···
       # upstream issue: missing file header
       fold-dwim = markBroken super.fold-dwim;
 
+      # build timeout
+      graphene = markBroken super.graphene;
+
       # upstream issue: mismatched filename
       helm-lobsters = markBroken super.helm-lobsters;