Allow insecure qtwebengine for stremio in CI

qtwebengine-5.15.19 is marked insecure but stremio requires it.
Add to permittedInsecurePackages for the pkgsQt import.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

flake.nix

@@ -247,7 +247,10 @@
         };
         pkgsQt = import inputs.nixpkgs-qt {
           inherit system;
-          config.allowUnfree = true;
+          config = {
+            allowUnfree = true;
+            permittedInsecurePackages = [ "qtwebengine-5.15.19" ];
+          };
         };
         # Version strings for flake input packages
         beadsRev = builtins.substring 0 8 (inputs.beads.rev or "unknown");