chore(deps): bump astro from 6.2.1 to 6.4.7 in /docs

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 6.2.1 to 6.4.7.
- [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@6.4.7/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.4.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/package-lock.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@astrojs/sitemap": "^3.7.2",
     "@astrojs/starlight": "0.38.4",
-    "astro": "6.2.1",
+    "astro": "6.4.7",
     "astro-mermaid": "^2.0.1",
     "sharp": "^0.34.5",
     "starlight-links-validator": "^0.24.0",