Bump happy-dom from 20.0.11 to 20.8.9 in /vuu-ui

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 20.0.11 to 20.8.9.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v20.0.11...v20.8.9)

---
updated-dependencies:
- dependency-name: happy-dom
  dependency-version: 20.8.9
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]