hostPlatform -> targetPlatform

flake.nix

@@ -173,7 +173,7 @@
 
       pkgs = import nixpkgs {
         inherit system;
-        hostPlatform = system;
+        targetPlatform = system;
         buildPlatform = builtins.currentSystem;
       };
       lib = import ./modules/lib.nix { inherit inputs pkgs; };

services/graphing-calculator.nix

@@ -5,7 +5,8 @@
   ...
 }:
 let
-  graphing-calculator = inputs.ytbn-graphing-software.packages.${pkgs.stdenv.hostPlatform.system}.web;
+  graphing-calculator =
+    inputs.ytbn-graphing-software.packages.${pkgs.stdenv.targetPlatform.system}.web;
 in
 {
   services.caddy.virtualHosts."graphing.${service_configs.https.domain}".extraConfig = ''

tests/minecraft.nix

@@ -8,7 +8,7 @@
 let
   # Create pkgs with nix-minecraft overlay and unfree packages allowed
   testPkgs = import inputs.nixpkgs {
-    system = pkgs.stdenv.hostPlatform.system;
+    system = pkgs.stdenv.targetPlatform.system;
     config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [ "minecraft-server" ];
     overlays = [
       inputs.nix-minecraft.overlay