Bump @nuxt/vite-builder and nuxt in /examples/nuxt3

Bumps [@nuxt/vite-builder](https://github.com/nuxt/nuxt/tree/HEAD/packages/vite) to 3.15.4 and updates ancestor dependency [nuxt](https://github.com/nuxt/nuxt/tree/HEAD/packages/nuxt). These dependencies need to be updated together.


Updates `@nuxt/vite-builder` from 3.10.3 to 3.15.4
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](https://github.com/nuxt/nuxt/commits/v3.15.4/packages/vite)

Updates `nuxt` from 3.10.3 to 3.15.4
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](https://github.com/nuxt/nuxt/commits/v3.15.4/packages/nuxt)

---
updated-dependencies:
- dependency-name: "@nuxt/vite-builder"
  dependency-type: indirect
- dependency-name: nuxt
  dependency-type: direct:production
...

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

Author: dependabot[bot]