ocamlPackages.stdlib-shims: use Dune 3

pkgs/development/ocaml-modules/stdlib-shims/default.nix

···
 { buildDunePackage, lib, fetchurl, ocaml }:
 
-buildDunePackage (rec {
+buildDunePackage rec {
   pname = "stdlib-shims";
   version = "0.3.0";
   src = fetchurl {
     url = "https://github.com/ocaml/${pname}/releases/download/${version}/${pname}-${version}.tbz";
     sha256 = "0jnqsv6pqp5b5g7lcjwgd75zqqvcwcl5a32zi03zg1kvj79p5gxs";
   };
-  minimalOCamlVersion = "4.02";
   doCheck = true;
   meta = {
     description = "Shims for forward-compatibility between versions of the OCaml standard library";
···
     inherit (ocaml.meta) license;
     maintainers = [ lib.maintainers.vbgl ];
   };
-} // lib.optionalAttrs (!lib.versionAtLeast ocaml.version "4.08") {
-  duneVersion = "1";
-})
+}