BUMP astro in /docs/starlight in the docs-dependencies group (#43)

Bumps the docs-dependencies group in /docs/starlight with 1 update: [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `astro` from 6.3.5 to 6.3.7
- [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@6.3.7/packages/astro)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 6.3.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: docs-dependencies
...

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Author: dependabot[bot]

docs/starlight/package-lock.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "^0.39.2",
-    "astro": "^6.3.5",
+    "astro": "^6.3.7",
     "sharp": "^0.34.5"
   },
   "overrides": {