chore(deps): bump dependencies

- @actions/core                ^1.11.1  →   ^2.0.1
- @astrojs/check                ^0.9.5  →   ^0.9.6
- @astrojs/starlight           ^0.36.3  →  ^0.37.1
- @astrojs/vercel               ^9.0.1  →   ^9.0.2
- @vercel/analytics             ^1.5.0  →   ^1.6.1
- astro                        ^5.16.0  →  ^5.16.6
- prettier                      ^3.6.2  →   ^3.7.4
- starlight-blog               ^0.25.1  →  ^0.25.2
- starlight-links-validator    ^0.19.1  →  ^0.19.2
- tsx                          ^4.20.6  →  ^4.21.0
- vercel                     ^48.10.14  →  ^50.1.3
- vitest                       ^4.0.14  →  ^4.0.16

Author: julien-deramond