build(deps): bump nuxt from 2.15.8 to 2.18.1

Bumps [nuxt](https://github.com/nuxt/nuxt/tree/HEAD/packages/nuxt) from 2.15.8 to 2.18.1.
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](https://github.com/nuxt/nuxt/commits/v2.18.1/packages/nuxt)

---
updated-dependencies:
- dependency-name: nuxt
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]