Bump astro from 5.16.8 to 5.16.9 in the astro group (#237)

Bumps the astro group with 1 update: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `astro` from 5.16.8 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
  dependency-group: astro
...

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Author: dependabot[bot]

bun.lock

@@ -24,7 +24,7 @@
     "@astrojs/sitemap": "^3.6.1",
     "@astrojs/starlight": "^0.37.2",
     "@plausible-analytics/tracker": "^0.4.4",
-    "astro": "^5.16.8",
+    "astro": "^5.16.9",
     "astro-mermaid": "^1.2.0",
     "starlight-theme-rapide": "^0.5.2"
   },