update nix flake

Author: mrnossiom

flake.lock

@@ -1,6 +1,6 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
 
     rust-overlay.url = "github:oxalica/rust-overlay";
     rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
@@ -37,7 +37,7 @@
 
       devShells = forAllPkgs (pkgs:
         let
-          inherit (pkgs) lib fetchFromGitHub;
+          inherit (pkgs) fetchFromGitHub;
 
           file-rust-toolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
           rust-toolchain = file-rust-toolchain.override { extensions = [ "rust-analyzer" ]; };
@@ -59,21 +59,17 @@
           });
         in
         {
-          default = pkgs.mkShell rec {
-            nativeBuildInputs = with pkgs; [
+          default = pkgs.mkShell {
+            packages = with pkgs; [
               pkg-config
               rust-toolchain
-              act
 
               cargo-dist
 
               wakatime-cli
             ];
 
-            buildInputs = [ ];
-
             RUST_SRC_PATH = pkgs.rustPlatform.rustLibSrc;
-            LD_LIBRARY_PATH = lib.makeLibraryPath buildInputs;
 
             RUST_LOG = "info";
           };