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

Set checkMeta = false in nixpkgs config to prevent it from complaining
about our custom meta attributes.

Change-Id: I044dc6e2804eacdf8f6136698536fa1b2df79f85
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6797
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

third_party/nixpkgs/default.nix

@@ -25,6 +25,9 @@ let
       // {
         allowUnfree = true;
         allowBroken = true;
+        # Forbids our meta.ci attribute
+        # https://github.com/NixOS/nixpkgs/pull/191171#issuecomment-1260650771
+        checkMeta = false;
       };
 
     inherit localSystem;