chore(flake): update nixpkgs branch unstable

Author: c0d3h01

flake.nix

@@ -2,7 +2,7 @@
   description = "NixOS configuration with flakes";
 
   inputs = {
-    nixpkgs.url = "git+https://github.com/nixos/nixpkgs?shallow=1&ref=nixos-unstable-small";
+    nixpkgs.url = "git+https://github.com/nixos/nixpkgs?shallow=1&ref=nixos-unstable";
     # nixpkgs-stable.url = "github:nixos/nixpkgs/nixos-25.05";
     nixos-hardware.url = "github:NixOS/nixos-hardware/master";
     systems.url = "github:nix-systems/default";