downgrade nixpkgs, cleanup

flake.lock

@@ -2,17 +2,17 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1645010845,
-        "narHash": "sha256-hO9X4PvxkSLMQnGGB7tOrKPwufhLMiNQMNXNwzLqneo=",
+        "lastModified": 1593034146,
+        "narHash": "sha256-EypP7RyPq5Yv05VgsQoIkdn26KJUIgQCItHgVY1MMQE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2128d0aa28edef51fd8fef38b132ffc0155595df",
+        "rev": "f8248ab6d9e69ea9c07950d73d48807ec595e923",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-21.11",
         "repo": "nixpkgs",
+        "rev": "f8248ab6d9e69ea9c07950d73d48807ec595e923",
         "type": "github"
       }
     },

flake.nix

@@ -1,6 +1,6 @@
 {
   description = "A Nix library to create and manage virtual machines running Windows.";
-  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-21.11;
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/f8248ab6d9e69ea9c07950d73d48807ec595e923;
   outputs = { self, nixpkgs }:
     let
       pkgs = import nixpkgs { system = "x86_64-linux"; };
@@ -9,8 +9,6 @@
       utils = (import wfvm/utils.nix { inherit pkgs; });
       # layers
       layers = (import wfvm/layers { inherit pkgs; }); # end of layers
-    
-    # ============
 
     # bundle
     bundleInstaller = pkgs.runCommandNoCC "win-bundle-installer.exe" {} ''
@@ -21,7 +19,6 @@
       env HOME=$(mktemp -d) GOOS=windows GOARCH=amd64 ${pkgs.go}/bin/go build
       mv bundle.exe $out
     '';
-    # /bundle ===========
 
     # makeWindowsImage 
     makeWindowsImage = attrs: ( import wfvm/win.nix { inherit pkgs bundleInstaller; } // attrs );