Bump astro from 5.12.8 to 5.12.9

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.12.8 to 5.12.9.
- [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: astro
  dependency-version: 5.12.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -11,6 +11,6 @@
   },
   "dependencies": {
     "@astrojs/starlight": "0.35.2",
-    "astro": "5.12.8"
+    "astro": "5.12.9"
   }
 }