Update to new syntax

alex/personal.nix

@@ -2,14 +2,14 @@
 
 let
   unstable = import inputs.nixpkgs-unstable {
-    system = pkgs.system;
+    system = pkgs.stdenv.hostPlatform.system;
     config.allowUnfree = true;
   };
 in
 {
   home.packages = with pkgs; [
     foliate
-    inputs.locutus.packages.${pkgs.system}.default
+    inputs.locutus.packages.${pkgs.stdenv.hostPlatform.system}.default
     jrnl
     mullvad-browser
     tor-browser