antibody: mark broken on darwin

pkgs/shells/zsh/antibody/default.nix

···
-{ lib, buildGoModule, fetchFromGitHub }:
+{ lib, stdenv, buildGoModule, fetchFromGitHub }:
 
 buildGoModule rec {
   pname = "antibody";
···
     homepage = "https://github.com/getantibody/antibody";
     license = licenses.mit;
     maintainers = with maintainers; [ Br1ght0ne ];
+
+    # golang.org/x/sys needs to be updated due to:
+    #
+    #   https://github.com/golang/go/issues/49219
+    #
+    # but this package is no longer maintained.
+    #
+    broken = stdenv.isDarwin;
   };
 }