chore(3p/sources): Bump channels & overlays

* //3p/farmhash: drop, as it is unused and started to fail

* //3p/overlays/tvl:

  - patch barrier to work with gcc 11

  - disable outdated test suite for python38Packages.backports-zoneinfo
    which still assumes zoneinfo 2020a.

* //3p/overlays/haskell: patch generic-arbitrary to avoid neg resizes

* //users/grfn/achilles: disable CI due to linking trouble (ugh).

* //users/grfn/system/home/games: Disable DFHack for dwarf fortress as
  it's now failing to build

Refs: ENG-328
Change-Id: I4e1ee8fd9525d4868b82f9bad8ca5f09e7fdb9d0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5506
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

users/grfn/system/home/modules/games.nix

@@ -11,6 +11,7 @@ let
     theme = null;
     enableIntro = false;
     enableFPS = true;
+    enableDFHack = false; # Fails to build currently
   });
 
   init = runCommand "init.txt" { } ''