chore(deps): bump dependencies

- `@astrojs/mdx`: 3.1.3 ‭→ 3.1.5
- `@astrojs/vercel`: 7.7.2 ‭→ 7.8.0
- `astro`: 4.14.2 ‭→ 4.15.2
- `vite`: 5.4.1 ‭→ 5.4.2
- `tsx`: 4.17.0 ‭→ 4.19.0

Author: julien-deramond