ops: repin cluster machines to older nixpkgs checkout

Change-Id: I592c689e33d81c131d389d87153900165aac19e5
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1486
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/ops/machines.nix b/ops/machines.nix
index be780a5..51a1f0d 100644
--- a/ops/machines.nix
+++ b/ops/machines.nix
@@ -103,7 +103,7 @@
     path
   ];
 
-  mkClusterMachineNew = machines: path: mkMachine machines pkgs [
+  mkClusterMachineNew = machines: path: mkMachine machines nixpkgsBgpwtf [
     ../cluster/machines/modules/base.nix
     ../cluster/machines/modules/kube-controlplane.nix
     ../cluster/machines/modules/kube-dataplane.nix