chore(deps): bump dependencies

- @astrojs/starlight          ^0.38.2  →   ^0.38.3
- starlight-links-validator   ^0.21.0  →   ^0.22.0
- vercel                     ^50.40.0  →  ^50.41.0
- vitest                       ^4.1.2  →    ^4.1.3

Author: julien-deramond