Bump starlight-typedoc from 0.18.0 to 0.21.4

Bumps [starlight-typedoc](https://github.com/HiDeoo/starlight-typedoc/tree/HEAD/packages/starlight-typedoc) from 0.18.0 to 0.21.4.
- [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/[email protected]/packages/starlight-typedoc)

---
updated-dependencies:
- dependency-name: starlight-typedoc
  dependency-version: 0.21.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

docs-src/package.json

@@ -17,7 +17,7 @@
     "astro": "^5.15.1",
     "sharp": "^0.34.3",
     "shepherd.js": "workspace:*",
-    "starlight-typedoc": "^0.18.0",
+    "starlight-typedoc": "^0.21.4",
     "tailwindcss": "^3.4.17",
     "typedoc": "^0.26.7",
     "typedoc-plugin-markdown": "4.2.9",