Polkit,Hypr, update kde-packages to qt6, remove portal

There is a warning to update before deprecation. This is a fix for that.
Remove a conflicting portal implementation

nixosModules/services/polkit/service.nix

@@ -8,7 +8,7 @@
   config = lib.mkIf config.polkit.enable {
     security.polkit.enable = true;
     environment.systemPackages = with pkgs; [
-      polkit-kde-agent
+      kdePackages.polkit-kde-agent-1
     ];
   };
 }