fix(home-manager): build error

home/xin/common/default.nix

@@ -1,4 +1,4 @@
-{ inputs, pkgs, ... }: {
+{ inputs, pkgs, lib, ... }: {
   imports = [ ];
 
   home.packages = with pkgs; [
@@ -19,6 +19,8 @@
 
     inetutils
   ];
+
+  nix.package = lib.mkForce pkgs.nixVersions.latest;
   nix.extraOptions = ''
     extra-substituters = https://nix-community.cachix.org
     extra-trusted-public-keys = nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs=

modules/home-manager/vscode.nix

@@ -105,6 +105,8 @@ in
     };
   };
   config = mkIf cfg.enable {
+    nixpkgs.config.allowUnfree = true;
+
     home.packages = lib.mkMerge ([
       [ pkgs.clang-tools ]
     ] ++ zipAttrsWithLanguageOption "systemPackages");