nix: fix deprecated attributes and update dev tools

- Fix deprecated flake output attributes (overlay -> overlays.default,
  devShell -> devShells.default, defaultPackage -> packages.default)
- Use stdenv.hostPlatform.system instead of deprecated prev.system
- Update grpc-gateway 2.24.0 -> 2.27.4
- Update protobuf-language-server
- Update nixpkgs

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1766840161,
-        "narHash": "sha256-Ss/LHpJJsng8vz1Pe33RSGIWUOcqM1fjrehjUkdrWio=",
+        "lastModified": 1768875095,
+        "narHash": "sha256-dYP3DjiL7oIiiq3H65tGIXXIT1Waiadmv93JS0sS+8A=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3edc4a30ed3903fdf6f90c837f961fa6b49582d1",
+        "rev": "ed142ab1b3a092c4d149245d0c4126a5d7ea00b0",
         "type": "github"
       },
       "original": {

flake.nix

@@ -23,9 +23,9 @@
         default = headscale;
       };
 
-      overlay = _: prev:
+      overlays.default = _: prev:
         let
-          pkgs = nixpkgs.legacyPackages.${prev.system};
+          pkgs = nixpkgs.legacyPackages.${prev.stdenv.hostPlatform.system};
           buildGo = pkgs.buildGo125Module;
           vendorHash = "sha256-escboufgbk+lEitw48eWEIltXbaCPdysb/g4YR+extg=";
         in
@@ -62,16 +62,16 @@
 
           protoc-gen-grpc-gateway = buildGo rec {
             pname = "grpc-gateway";
-            version = "2.24.0";
+            version = "2.27.4";
 
             src = pkgs.fetchFromGitHub {
               owner = "grpc-ecosystem";
               repo = "grpc-gateway";
               rev = "v${version}";
-              sha256 = "sha256-lUEoqXJF1k4/il9bdDTinkUV5L869njZNYqObG/mHyA=";
+              sha256 = "sha256-4bhEQTVV04EyX/qJGNMIAQDcMWcDVr1tFkEjBHpc2CA=";
             };
 
-            vendorHash = "sha256-Ttt7bPKU+TMKRg5550BS6fsPwYp0QJqcZ7NLrhttSdw=";
+            vendorHash = "sha256-ohZW/uPdt08Y2EpIQ2yeyGSjV9O58+QbQQqYrs6O8/g=";
 
             nativeBuildInputs = [ pkgs.installShellFiles ];
 
@@ -80,16 +80,16 @@
 
           protobuf-language-server = buildGo rec {
             pname = "protobuf-language-server";
-            version = "2546944";
+            version = "1cf777d";
 
             src = pkgs.fetchFromGitHub {
               owner = "lasorda";
               repo = "protobuf-language-server";
-              rev = "${version}";
-              sha256 = "sha256-Cbr3ktT86RnwUntOiDKRpNTClhdyrKLTQG2ZEd6fKDc=";
+              rev = "1cf777de4d35a6e493a689e3ca1a6183ce3206b6";
+              sha256 = "sha256-9MkBQPxr/TDr/sNz/Sk7eoZwZwzdVbE5u6RugXXk5iY=";
             };
 
-            vendorHash = "sha256-PfT90dhfzJZabzLTb1D69JCO+kOh2khrlpF5mCDeypk=";
+            vendorHash = "sha256-4nTpKBe7ekJsfQf+P6edT/9Vp2SBYbKz1ITawD3bhkI=";
 
             subPackages = [ "." ];
           };
@@ -129,7 +129,7 @@
       (system:
       let
         pkgs = import nixpkgs {
-          overlays = [ self.overlay ];
+          overlays = [ self.overlays.default ];
           inherit system;
         };
         buildDeps = with pkgs; [ git go_1_25 gnumake ];
@@ -182,9 +182,9 @@
           config.Entrypoint = [ (pkgs.headscale + "/bin/headscale") ];
         };
       in
-      rec {
+      {
         # `nix develop`
-        devShell = pkgs.mkShell {
+        devShells.default = pkgs.mkShell {
           buildInputs =
             devDeps
             ++ [
@@ -219,14 +219,16 @@
         packages = with pkgs; {
           inherit headscale;
           inherit headscale-docker;
+          default = headscale;
         };
-        defaultPackage = pkgs.headscale;
 
         # `nix run`
         apps.headscale = flake-utils.lib.mkApp {
-          drv = packages.headscale;
+          drv = pkgs.headscale;
+        };
+        apps.default = flake-utils.lib.mkApp {
+          drv = pkgs.headscale;
         };
-        apps.default = apps.headscale;
 
         checks = {
           headscale = pkgs.testers.nixosTest (import ./nix/tests/headscale.nix);