chore(deps): Bump zod and astro in /demo (#97)

Bumps [zod](https://github.com/colinhacks/zod) to 3.22.4 and updates ancestor dependency [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro). These dependencies need to be updated together.


Updates `zod` from 3.21.1 to 3.22.4
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Changelog](https://github.com/colinhacks/zod/blob/master/CHANGELOG.md)
- [Commits](colinhacks/zod@v3.21.1...v3.22.4)

Updates `astro` from 3.3.1 to 4.0.6
- [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: zod
  dependency-type: indirect
- dependency-name: astro
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>