chore(deps-dev): bump astro from 4.16.16 to 4.16.18 (#1419)

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 4.16.16 to 4.16.18.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/[email protected]/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/[email protected]/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-type: direct:development
...

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

Author: dependabot[bot]