Update dependency go to v1.25.4

flake.nix

@@ -16,7 +16,7 @@
         pkgs.buildGo123Module rec {
           name = "vpngate";
           src = ./.;
-          vendorHash = "sha256-CP2sFJdIde88WFJlAq29GlE7c1c0xJ6tHzrrasMzIo8=";
+          vendorHash = "sha256-CP2sFJdIde88WFJlAq29GlE7c1c0xJ6tHzrrasMzJo8=";
           nativeBuildInputs = pkgs.lib.optionals pkgs.stdenv.isLinux [ pkgs.makeWrapper ];
           env.CGO_ENABLED = 0;
           doCheck = false;
@@ -37,7 +37,7 @@
             packages = with pkgs; [
               gopls
               gotools
-              go_1_25
+              go_1_23
             ];
           };
         };

go.mod

@@ -2,7 +2,7 @@ module github.com/davegallant/vpngate
 
 go 1.24.0
 
-toolchain go1.24.9
+toolchain go1.25.4
 
 require (
 	github.com/AlecAivazis/survey/v2 v2.3.7