build(deps-dev): bump vitepress from 1.0.0-rc.39 to 1.0.0-rc.42 (#877)

Bumps [vitepress](https://github.com/vuejs/vitepress) from 1.0.0-rc.39 to 1.0.0-rc.42.
- [Release notes](https://github.com/vuejs/vitepress/releases)
- [Changelog](https://github.com/vuejs/vitepress/blob/main/CHANGELOG.md)
- [Commits](vuejs/vitepress@v1.0.0-rc.39...v1.0.0-rc.42)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>