chore(deps): bump astro from 5.16.6 to 6.4.6

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 5.16.6 to 6.4.6.
- [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@6.4.6/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.4.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]

apps/docs/package.json

@@ -14,7 +14,7 @@
     "@astrojs/starlight-tailwind": "^4.0.2",
     "@iconify/tailwind": "^1.2.0",
     "@tailwindcss/vite": "^4.1.18",
-    "astro": "^5.6.1",
+    "astro": "^6.4.6",
     "astro-mermaid": "^1.2.0",
     "iconify-icon": "^3.0.2",
     "mermaid": "^11.12.2",