feat: use Lix ffs

I ran into a bug with Nix 2.18.2.

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

modules/nix-daemon.nix

@@ -57,9 +57,8 @@ in
       # Randomize GC to avoid thundering herd effects.
       gc.randomizedDelaySec = "1800";
 
-      # Inchallah, it works.
-      package = pkgs.nixVersions.nix_2_18;
-      # package = lib.mkForce inputs.nixpkgs-unstable.legacyPackages.x86_64-linux.nixVersions.nix_2_17;
+      # A much better choice.
+      package = pkgs.lix;
 
       # should be enough?
       nrBuildUsers = 128;