ocamlPackages.ocp-index: use Dune 3

+2
+2
pkgs/development/tools/ocaml/ocp-index/default.nix
··· 4 pname = "ocp-index"; 5 version = "1.3.4"; 6 7 minimalOCamlVersion = "4.08"; 8 9 src = fetchFromGitHub {
··· 4 pname = "ocp-index"; 5 version = "1.3.4"; 6 7 + duneVersion = "3"; 8 + 9 minimalOCamlVersion = "4.08"; 10 11 src = fetchFromGitHub {