chore(release): publish packages

[johannesvedder]

• studyu_app@2.7.9
• studyu_core@4.4.6
• studyu_designer_v2@1.9.0
• studyu_flutter_common@1.8.7

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 0670609):

• https://studyu-dev-app--pr678-release-20240812-xpb7pj9f.web.app
• https://studyu-dev-designer--pr678-release-20240812-uxzvyhrj.web.app

_{(expires Mon, 19 Aug 2024 16:37:11 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 2149dad49ed83535217e50d5c18c0c8c90da629b}