Bump prettier-plugin-svelte from 2.8.1 to 2.9.0 in /docs/vercel (#955)

Bumps [prettier-plugin-svelte](https://github.com/sveltejs/prettier-plugin-svelte) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/sveltejs/prettier-plugin-svelte/releases)
- [Changelog](https://github.com/sveltejs/prettier-plugin-svelte/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/prettier-plugin-svelte/commits)

---
updated-dependencies:
- dependency-name: prettier-plugin-svelte
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

docs/vercel/package-lock.json

@@ -22,7 +22,7 @@
     "eslint": "^8.31.0",
     "eslint-plugin-svelte3": "^4.0.0",
     "prettier": "^2.8.0",
-    "prettier-plugin-svelte": "^2.8.1",
+    "prettier-plugin-svelte": "^2.9.0",
     "svelte": "^3.55.0",
     "svelte-check": "^3.0.1",
     "svelte-preprocess": "^5.0.0",