refactor(3p): use josh from nixpkgs

The change we need has been released and propagated to nixos channels.

Change-Id: Ib10a1d42d7ef6deaf5665a13b72ece345e83d7dc
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11457
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

users/tazjin/nixos/modules/physical.nix

@@ -24,7 +24,6 @@ in
         users.tazjin.chase-geese
         config.tazjin.emacs
         third_party.agenix.cli
-        third_party.josh
       ]) ++
 
       # programs from nixpkgs
@@ -50,6 +49,7 @@ in
         hyperfine
         iftop
         imagemagick
+        josh
         jq
         lieer
         maim