Bump nuxt from 2.15.8 to 3.4.3 in /webui

Bumps [nuxt](https://github.com/nuxt/nuxt) from 2.15.8 to 3.4.3.
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](nuxt/nuxt@v2.15.8...v3.4.3)

---
updated-dependencies:
- dependency-name: nuxt
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>