ocamlPackages.yuscii: use Dune 3

pkgs/development/ocaml-modules/yuscii/default.nix

···
   version = "0.3.0";
 
   minimalOCamlVersion = "4.03";
+  duneVersion = "3";
 
   src = fetchzip {
     url = "https://github.com/mirage/yuscii/releases/download/v${version}/yuscii-v${version}.tbz";