Bump astro from 5.16.6 to 5.16.9

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.16.6 to 5.16.9.
- [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/astro@5.16.9/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.16.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -12,7 +12,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "^0.37.2",
-    "astro": "^5.16.8",
+    "astro": "^5.16.11",
     "sharp": "^0.34.5",
     "starlight-kbd": "^0.3.0",
     "starlight-links-validator": "^0.19.2",