build(deps): bump astro from 6.3.7 to 6.4.6 in /docs (#5)

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 6.3.7 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
...

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Author: dependabot[bot]

docs/package.json

@@ -17,7 +17,7 @@
     "@fontsource-variable/fraunces": "^5.2.9",
     "@fontsource-variable/ibm-plex-sans": "^5.2.8",
     "@fontsource/ibm-plex-mono": "^5.2.7",
-    "astro": "^6.3.3",
+    "astro": "^6.4.6",
     "sharp": "^0.34.5"
   },
   "pnpm": {