Bump @astrojs/starlight from 0.38.5 to 0.39.2

Bumps [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) from 0.38.5 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]

package-lock.json

@@ -11,7 +11,7 @@
     "lint": "node lint.mjs"
   },
   "dependencies": {
-    "@astrojs/starlight": "^0.38.5",
+    "@astrojs/starlight": "^0.39.2",
     "astro": "^6.2.2",
     "katex": "^0.16.45",
     "micromark": "^4.0.2",