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](https://github.com/kpdecker/jsdiff/compare/v5.2.0...v8.0.3)

Updates `astro` from 5.16.9 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
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -20,7 +20,7 @@
     "@fontsource-variable/jetbrains-mono": "^5.2.8",
     "@iconify-json/heroicons": "^1.2.3",
     "@iconify-json/simple-icons": "^1.2.65",
-    "astro": "^5.16.8",
+    "astro": "^5.16.11",
     "astro-icon": "^1.1.5",
     "rehype-autolink-headings": "^7.1.0",
     "rehype-slug": "^6.0.0",