Bump cookie and astro in /docs

Bumps [cookie](https://github.com/jshttp/cookie) to 0.7.2 and updates ancestor dependency [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro). These dependencies need to be updated together.


Updates `cookie` from 0.6.0 to 0.7.2
- [Release notes](https://github.com/jshttp/cookie/releases)
- [Commits](jshttp/cookie@v0.6.0...v0.7.2)

Updates `astro` from 4.9.2 to 4.15.12
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/[email protected]/packages/astro)

---
updated-dependencies:
- dependency-name: cookie
  dependency-type: indirect
- dependency-name: astro
  dependency-type: direct:production
...

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