chore(deps-dev): bump vitepress from 1.0.0-alpha.28 to 1.0.0-alpha.31 (…

…#1026)

Bumps [vitepress](https://github.com/vuejs/vitepress) from 1.0.0-alpha.28 to 1.0.0-alpha.31.
- [Release notes](https://github.com/vuejs/vitepress/releases)
- [Changelog](https://github.com/vuejs/vitepress/blob/main/CHANGELOG.md)
- [Commits](vuejs/vitepress@v1.0.0-alpha.28...v1.0.0-alpha.31)

---
updated-dependencies:
- dependency-name: vitepress
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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