Bump astro from 6.1.4 to 6.4.8

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 6.1.4 to 6.4.8.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/astro@6.4.8/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@6.4.8/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.4.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "^0.38.2",
-    "astro": "^6.1.2",
+    "astro": "^6.4.8",
     "mermaid": "^11.14.0",
     "sharp": "^0.34.1"
   },