build(deps): bump @nuxt/devtools and nuxt in /frontend

Bumps [@nuxt/devtools](https://github.com/nuxt/devtools/tree/HEAD/packages/devtools) to 3.1.0 and updates ancestor dependency [nuxt](https://github.com/nuxt/nuxt/tree/HEAD/packages/nuxt). These dependencies need to be updated together.


Updates `@nuxt/devtools` from 1.7.0 to 3.1.0
- [Release notes](https://github.com/nuxt/devtools/releases)
- [Changelog](https://github.com/nuxt/devtools/blob/main/CHANGELOG.md)
- [Commits](https://github.com/nuxt/devtools/commits/v3.1.0/packages/devtools)

Updates `nuxt` from 3.15.4 to 3.20.1
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](https://github.com/nuxt/nuxt/commits/v3.20.1/packages/nuxt)

---
updated-dependencies:
- dependency-name: "@nuxt/devtools"
  dependency-version: 3.1.0
  dependency-type: indirect
- dependency-name: nuxt
  dependency-version: 3.20.1
  dependency-type: direct:development
...

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Author: dependabot[bot]