build(deps): bump astro from 6.3.6 to 6.3.8

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) from 6.3.6 to 6.3.8.
- [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@6.3.8/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.3.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "^0.39.2",
-    "astro": "^6.3.6",
+    "astro": "^6.3.8",
     "starlight-blog": "^0.26.1",
     "starlight-links-validator": "^0.24.0"
   },