Bump diff and astro

Bumps [diff](https://github.com/kpdecker/jsdiff) to 8.0.3 and updates ancestor dependency [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro). These dependencies need to be updated together.


Updates `diff` from 5.2.0 to 8.0.3
- [Changelog](https://github.com/kpdecker/jsdiff/blob/master/release-notes.md)
- [Commits](kpdecker/jsdiff@v5.2.0...v8.0.3)

Updates `astro` from 5.15.9 to 5.16.11
- [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/astro@5.16.11/packages/astro)

---
updated-dependencies:
- dependency-name: diff
  dependency-version: 8.0.3
  dependency-type: indirect
- dependency-name: astro
  dependency-version: 5.16.11
  dependency-type: direct:production
...

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Author: dependabot[bot]