cardboard: mark broken (gcc-13 build failure)

Upstream project is archived and orphaned on gitlab homepage. The
derivation fails to build as https://hydra.nixos.org/build/247698884:

    ...-gcc-13.2.0/include/c++/13.2.0/type_traits:1417:30: error: invalid use of incomplete type 'struct Seat' [-fpermissive]
     1417 |     : public __bool_constant<__is_convertible(_From, _To)>
          |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
    In file included from ../cardboard/OutputManager.h:25,
                     from ../cardboard/Cursor.h:23,
                     from ../cardboard/Listener.h:28,
                     from ../cardboard/Helpers.h:16,
                     from ../cardboard/Server.cpp:39:
    ../cardboard/Workspace.h:32:8: note: forward declaration of 'struct Seat'
       32 | struct Seat;
          |        ^~~~

pkgs/by-name/ca/cardboard/package.nix

@@ -127,6 +127,7 @@ stdenv.mkDerivation {
   };
 
   meta = {
+    broken = true; # Upstream is archived, fails to build on gcc-13.
     homepage = "https://gitlab.com/cardboardwm/cardboard";
     description = "A scrollable, tiling Wayland compositor inspired on PaperWM";
     license = lib.licenses.gpl3Only;