Update dependencies and bump Helium

Refresh flake.lock with newer revisions and hashes for packages.
Upgrade Helium AppImage to version 0.20.3.1.
Remove hyprland-qtutils from essentials package list.
Update Codex ponytail plugin to v5.3.3 with new SHA256 hash.

modules/core/packages/appimages/helium.nix

@@ -4,8 +4,8 @@
   fetchurl,
 }: let
   pname = "helium";
-  version = "0.20.2.1";
-  hash = "sha256-rEkoQk0xyGP/86t1076HPfyS7eAOaIljTcvFiBoSA5c=";
+  version = "0.20.3.1";
+  hash = "sha256-H69Thkj+FKHqkuMlyxI4rojEeGZsteY9DSrxcP5MoDc=";
 
   src = fetchurl {
     url = "https://github.com/imputnet/helium-linux/releases/download/${version}/helium-${version}-x86_64.AppImage";

modules/core/packages/essentials.nix

@@ -73,7 +73,6 @@
     swappy
     ydotool
     hyprpolkitagent
-    hyprland-qtutils # needed for banners and ANR messages
     # pyprland
     pyprland
   ];