Bump starlight-typedoc from 0.18.0 to 0.21.5

Bumps [starlight-typedoc](https://github.com/HiDeoo/starlight-typedoc/tree/HEAD/packages/starlight-typedoc) from 0.18.0 to 0.21.5.
- [Release notes](https://github.com/HiDeoo/starlight-typedoc/releases)
- [Changelog](https://github.com/HiDeoo/starlight-typedoc/blob/main/packages/starlight-typedoc/CHANGELOG.md)
- [Commits](https://github.com/HiDeoo/starlight-typedoc/commits/starlight-typedoc@0.21.5/packages/starlight-typedoc)

---
updated-dependencies:
- dependency-name: starlight-typedoc
  dependency-version: 0.21.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

docs-src/package.json

@@ -14,7 +14,7 @@
     "@astrojs/starlight": "^0.31.1",
     "astro": "^5.16.6",
     "shepherd.js": "workspace:*",
-    "starlight-typedoc": "^0.18.0"
+    "starlight-typedoc": "^0.21.5"
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.4",