chore(deps-dev): bump the vuepress group with 2 updates

Bumps the vuepress group with 2 updates: [vuepress](https://github.com/vuejs/vuepress/tree/HEAD/packages/vuepress) and [vuepress-plugin-sitemap2](https://github.com/vuepress-theme-hope/vuepress-theme-hope/tree/HEAD/packages/sitemap2).


Updates `vuepress` from 2.0.0-beta.67 to 2.0.0-rc.0
- [Release notes](https://github.com/vuejs/vuepress/releases)
- [Changelog](https://github.com/vuejs/vuepress/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vuepress/commits/HEAD/packages/vuepress)

Updates `vuepress-plugin-sitemap2` from 2.0.0-beta.247 to 2.0.0-rc.0
- [Release notes](https://github.com/vuepress-theme-hope/vuepress-theme-hope/releases)
- [Changelog](https://github.com/vuepress-theme-hope/vuepress-theme-hope/blob/main/CHANGELOG.md)
- [Commits](https://github.com/vuepress-theme-hope/vuepress-theme-hope/commits/v2.0.0-rc.0/packages/sitemap2)

---
updated-dependencies:
- dependency-name: vuepress
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vuepress
- dependency-name: vuepress-plugin-sitemap2
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vuepress
...

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