use qt6 cantata fork

package pulled from nixpkgs issue

modules/overlay-pkgs/default.nix

@@ -1,10 +1,11 @@
-{ inputs, ... }: {
+{ inputs, pkgs, ... }: {
   nixpkgs.overlays = [
     inputs.nur.overlay
 
     (final: prev: {
       kwrite = final.kdePackages.callPackage ./kwrite.nix {};
       mcontrolcenter = final.callPackage ./mcontrolcenter.nix {};
+      cantata = final.qt6Packages.callPackage ./cantata {};
     })
   ];
 }