chore(3p): bump NixOS channels to 2022-01-12

Temporarily use a master commit as some interesting failures have been
fixed there (yubikey-manager and notmuch).

* //users/tazjin/nixos/camden: The acme module was moved around, so we
  need to adjust the disabled module path.

Change-Id: I21c6a1963ffe4205f3577f531ce10b778a82e2ff
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4865
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

third_party/overlays/tvl.nix

@@ -49,14 +49,4 @@ self: super: {
   mkShell = super.lib.makeOverridable(args: (super.mkShell args) // {
     meta.ci = false;
   });
-
-  # TODO(tazjin): determine whether this is the cause of my suspend
-  # bugs, and if so, upstream it to nixpkgs.
-  xsecurelock = super.xsecurelock.overrideAttrs(drv: rec {
-    buildInputs = drv.buildInputs ++ [ self.makeWrapper ];
-    postInstall = ''
-      wrapProgram $out/libexec/xsecurelock/saver_blank \
-        --prefix PATH : ${self.coreutils}/bin
-    '';
-  });
 }