build(deps): bump astro from 5.18.1 to 6.1.6 in /docs

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.18.1 to 6.1.6.
- [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@6.1.6/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.1.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@astrojs/starlight": "0.37.6",
     "@vercel/analytics": "^1.6.1",
-    "astro": "5.18.1",
+    "astro": "6.1.6",
     "sharp": "^0.34.2"
   },
   "devDependencies": {