Bump astro from 1.9.2 to 5.15.9

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 1.9.2 to 5.15.9.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG-v1.md)
- [Commits](https://github.com/withastro/astro/commits/[email protected]/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.15.9
  dependency-type: direct:production
...

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

Author: dependabot[bot]

apps/docs/package.json

@@ -20,7 +20,7 @@
         "@types/node": "^18.0.0",
         "@types/react": "^17.0.45",
         "@types/react-dom": "^18.0.0",
-        "astro": "^1.4.2",
+        "astro": "^5.15.9",
         "preact": "^10.7.3",
         "react": "^18.1.0",
         "react-dom": "^18.1.0"