Remove unstable channel

configuration.nix

@@ -4,12 +4,6 @@
 
 { config, lib, pkgs, ... }:
 
-let unstable = import (builtins.fetchTarball {
-  name = "nixos-unstable-2024-12-08";
-  url = "https://github.com/NixOS/nixpkgs/archive/868be2c9df2ffdb40b6aee3d156f1df603555539.tar.gz";
-  sha256 = "0s7xzhv4a98j6kbas1q4pd3ln1l5hfamp4db4wx5mif0110n5scv";
-}) {};
-in
 {
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
   imports =
@@ -134,9 +128,9 @@ in
     brave
     vscodium
     neovim
-    unstable.docker-compose
+    docker-compose
     nodejs
-    unstable.signal-desktop
+    signal-desktop
     telegram-desktop
     rustup gcc pkg-config
     gimp
@@ -155,7 +149,7 @@ in
     file
     gnumake
     awscli2
-    unstable.code-cursor
+    code-cursor
     pavucontrol
     libnotify
     alsa-tools