Bump vitepress from 1.3.3 to 1.3.4 in /docs

Bumps [vitepress](https://github.com/vuejs/vitepress) from 1.3.3 to 1.3.4.
- [Release notes](https://github.com/vuejs/vitepress/releases)
- [Changelog](https://github.com/vuejs/vitepress/blob/main/CHANGELOG.md)
- [Commits](vuejs/vitepress@v1.3.3...v1.3.4)

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

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

docs/package.json

@@ -5,6 +5,6 @@
     "docs:preview": "vitepress preview"
   },
   "devDependencies": {
-    "vitepress": "^1.3.3"
+    "vitepress": "^1.3.4"
   }
 }