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

* //users/wpcarro/avaSystem: disable hidpi

  Recent changes have made nixpkgs adopt the position that hidpi
  optimization can't be done generically and at the very least needs to
  know a specific DPI number to optimize for. In addition to knowledge
  of the display(s) in question (i.e. wpcarro needs to do this) the
  issue <https://github.com/NixOS/nixpkgs/issues/222805> can give
  guidance as to how to restore the desired hidpi look and feel.

Change-Id: Ia4b079a06dcb710050619f350cd0655216b4a42f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8345
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: wpcarro <wpcarro@gmail.com>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

third_party/josh/default.nix

@@ -2,6 +2,7 @@
 { depot, pkgs, ... }:
 
 let
+  # TODO(sterni): switch to pkgs.josh as soon as that commit is released
   rev = "fc857afda2c1536234e3bb1983c518a1abf63d25";
   src = pkgs.fetchFromGitHub {
     owner = "josh-project";