chore(deps-dev): bump vercel in the github-actions group

Bumps the github-actions group with 1 update: [vercel](https://github.com/vercel/vercel/tree/HEAD/packages/cli).


Updates `vercel` from 51.1.0 to 51.2.1
- [Release notes](https://github.com/vercel/vercel/releases)
- [Changelog](https://github.com/vercel/vercel/blob/main/packages/cli/CHANGELOG.md)
- [Commits](https://github.com/vercel/vercel/commits/[email protected]/packages/cli)

---
updated-dependencies:
- dependency-name: vercel
  dependency-version: 51.2.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -40,7 +40,7 @@
     "starlight-links-validator": "^0.23.0",
     "starlight-showcases": "^0.3.2",
     "tsx": "^4.21.0",
-    "vercel": "^51.1.0",
+    "vercel": "^51.2.1",
     "vitest": "^4.1.4"
   }
 }