Bump @vuepress/client from 2.0.0-beta.67 to 2.0.0-rc.0 in /docs

Bumps [@vuepress/client](https://github.com/vuepress/vuepress-next) from 2.0.0-beta.67 to 2.0.0-rc.0.
- [Release notes](https://github.com/vuepress/vuepress-next/releases)
- [Changelog](https://github.com/vuepress/vuepress-next/blob/main/CHANGELOG.md)
- [Commits](vuepress/core@v2.0.0-beta.67...v2.0.0-rc.0)

---
updated-dependencies:
- dependency-name: "@vuepress/client"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

docs/package.json

@@ -13,7 +13,7 @@
     "docs:build": "vuepress build docs"
   },
   "devDependencies": {
-    "@vuepress/client": "2.0.0-beta.67",
+    "@vuepress/client": "2.0.0-rc.0",
     "vue": "^3.3.2",
     "vuepress": "^2.0.0-rc.0"
   }