Bump @vuepress/bundler-vite from 2.0.0-rc.30 to 2.0.0-rc.31 in /docs

Bumps [@vuepress/bundler-vite](https://github.com/vuepress/core) from 2.0.0-rc.30 to 2.0.0-rc.31.
- [Release notes](https://github.com/vuepress/core/releases)
- [Changelog](https://github.com/vuepress/core/blob/main/CHANGELOG.md)
- [Commits](vuepress/core@v2.0.0-rc.30...v2.0.0-rc.31)

---
updated-dependencies:
- dependency-name: "@vuepress/bundler-vite"
  dependency-version: 2.0.0-rc.31
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]