Bump defu and nuxt

Bumps [defu](https://github.com/unjs/defu) to 6.1.7 and updates ancestor dependency [nuxt](https://github.com/nuxt/nuxt/tree/HEAD/packages/nuxt). These dependencies need to be updated together.


Updates `defu` from 6.1.4 to 6.1.7
- [Release notes](https://github.com/unjs/defu/releases)
- [Changelog](https://github.com/unjs/defu/blob/main/CHANGELOG.md)
- [Commits](unjs/defu@v6.1.4...v6.1.7)

Updates `nuxt` from 2.17.3 to 4.4.2
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](https://github.com/nuxt/nuxt/commits/v4.4.2/packages/nuxt)

---
updated-dependencies:
- dependency-name: defu
  dependency-version: 6.1.6
  dependency-type: indirect
- dependency-name: nuxt
  dependency-version: 4.4.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]