fix: use KDE Invent registry image for deb build

Docker Hub kdeneon images are stuck on Plasma 5.27 / Ubuntu 22.04.
The KDE Invent registry has up-to-date images with Plasma 6.6+ on
Ubuntu 24.04 (noble).

Co-Authored-By: claude-flow <ruv@ruv.net>

Author: fuddlesworth

.github/workflows/release.yml

@@ -39,7 +39,7 @@ jobs:
     needs: version
     runs-on: ubuntu-latest
     container:
-      image: kdeneon/all:user
+      image: invent-registry.kde.org/neon/docker-images/plasma:user
       options: --user root
 
     steps: