nixos/netboot: Remove pinned iPXE

nixos/modules/netboot/default.nix

@@ -5,23 +5,10 @@ let
 
   cfg = config.my.netboot;
 
-  # Newer releases don't boot on desktop?
-  ipxe = pkgs.ipxe.overrideAttrs (o: rec {
-    version = "1.21.1-unstable-2024-06-27";
-    src = pkgs.fetchFromGitHub {
-      owner = "ipxe";
-      repo = "ipxe";
-      rev = "b66e27d9b29a172a097c737ab4d378d60fe01b05";
-      hash = "sha256-TKZ4WjNV2oZIYNefch7E7m1JpeoC/d7O1kofoNv8G40=";
-    };
-
-    # This upstream patch (in newer versions) is needed for newer GCC
-    patches = (if (o ? patches) then o.patches else []) ++ [ ./fix-uninitialised-var.patch ];
-  });
   tftpRoot = pkgs.linkFarm "tftp-root" [
     {
       name = "ipxe-x86_64.efi";
-      path = "${ipxe}/ipxe.efi";
+      path = "${pkgs.ipxe}/ipxe.efi";
     }
   ];
   menuFile = pkgs.runCommand "menu.ipxe" {