chore(deps): bump @astrojs/starlight from 0.38.4 to 0.39.2 in /docs

Bumps [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) from 0.38.4 to 0.39.2.
- [Release notes](https://github.com/withastro/starlight/releases)
- [Changelog](https://github.com/withastro/starlight/blob/main/packages/starlight/CHANGELOG.md)
- [Commits](https://github.com/withastro/starlight/commits/@astrojs/starlight@0.39.2/packages/starlight)

---
updated-dependencies:
- dependency-name: "@astrojs/starlight"
  dependency-version: 0.39.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

docs/package-lock.json

@@ -20,7 +20,7 @@
   "dependencies": {
     "@astrojs/rss": "^4.0.18",
     "@astrojs/sitemap": "^3.7.2",
-    "@astrojs/starlight": "^0.38.4",
+    "@astrojs/starlight": "^0.39.2",
     "@primer/octicons": "^19.25.0",
     "astro": "^6.3.1",
     "astro-mermaid": "^2.0.1",