build(deps-dev): bump vitepress from 1.0.0-rc.25 to 1.0.0-rc.28

Bumps [vitepress](https://github.com/vuejs/vitepress) from 1.0.0-rc.25 to 1.0.0-rc.28.
- [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.25...v1.0.0-rc.28)

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

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

package.json

@@ -11,7 +11,7 @@
     "serve": "vitepress serve docs"
   },
   "devDependencies": {
-    "vitepress": "^1.0.0-rc.25",
+    "vitepress": "^1.0.0-rc.28",
     "vue": "^3.3.8"
   }
 }