fix(deps): bump @pinia/nuxt from 0.2.1 to 0.3.1

Bumps [@pinia/nuxt](https://github.com/vuejs/pinia) from 0.2.1 to 0.3.1.
- [Release notes](https://github.com/vuejs/pinia/releases)
- [Commits](https://github.com/vuejs/pinia/compare/@pinia/nuxt@0.2.1...@pinia/nuxt@0.3.1)

---
updated-dependencies:
- dependency-name: "@pinia/nuxt"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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