chore(deps): bump astro from 6.0.8 to 6.1.8 in /docs (#4795)

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 6.0.8 to 6.1.8.
- [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@6.1.8/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.1.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/package-lock.json

@@ -16,7 +16,7 @@
     "@astrojs/starlight": "^0.38.2",
     "@astrojs/starlight-tailwind": "^5.0.0",
     "@fontsource-variable/figtree": "^5.2.6",
-    "astro": "^6.0.8",
+    "astro": "^6.1.8",
     "sharp": "^0.34.1",
     "tailwindcss": "^4.1.4",
     "typescript": "^5.7.3"