chore(deps-dev): bump vitepress from 2.0.0-alpha.11 to 2.0.0-alpha.12

Bumps [vitepress](https://github.com/vuejs/vitepress) from 2.0.0-alpha.11 to 2.0.0-alpha.12.
- [Release notes](https://github.com/vuejs/vitepress/releases)
- [Changelog](https://github.com/vuejs/vitepress/blob/main/CHANGELOG.md)
- [Commits](vuejs/vitepress@v2.0.0-alpha.11...v2.0.0-alpha.12)

---
updated-dependencies:
- dependency-name: vitepress
  dependency-version: 2.0.0-alpha.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs/package.json

@@ -25,7 +25,7 @@
   "devDependencies": {
     "@types/node": "^24.3.0",
     "prettier": "^3.6.2",
-    "vitepress": "2.0.0-alpha.11"
+    "vitepress": "2.0.0-alpha.12"
   },
   "dependencies": {
     "vitepress-plugin-group-icons": "^1.6.3",