chore(deps): bump astro in /website in the dependencies group (#1779)

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


Updates `astro` from 5.16.3 to 5.16.4
- [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@5.16.4/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 5.16.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

website/package-lock.json

@@ -26,7 +26,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "^0.37.0",
-    "astro": "^5.16.3",
+    "astro": "^5.16.4",
     "sharp": "^0.34.5",
     "starlight-llms-txt": "^0.6.0"
   },