aliases: keep the utillinux alias until node2nix is phased out

The code generated by `node2nix` checks that `pkgs.utillinux` exist and
uses it over `pkgs.util-linux`. Replacing the alias by a `throw`, as was
done in commit a9e1f4e, makes packages
generated using `node2nix` fail.

This removes the alias removal until `node2nix` has been phased out,
which is a work in progress started in
#229475.

pkgs/top-level/aliases.nix

@@ -1672,7 +1672,7 @@ mapAliases {
   usbguard-nox = throw "'usbguard-nox' has been renamed to/replaced by 'usbguard'"; # Converted to throw 2023-09-10
   utahfs = throw "utahfs has been removed, as it is broken and lack of maintenance from upstream"; # Added 2023-09-29
   util-linuxCurses = util-linux; # Added 2022-04-12
-  utillinux = throw "'utillinux' has been renamed to/replaced by 'util-linux'"; # Converted to throw 2024-10-17
+  utillinux = util-linux; # Added 2020-11-24, keep until node2nix is phased out, see https://github.com/NixOS/nixpkgs/issues/229475
 
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