[docs]: Bump @astrojs/starlight from 0.28.2 to 0.28.3 in /docs

Bumps [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) from 0.28.2 to 0.28.3.
- [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@0.28.3/packages/starlight)

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

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

docs/package.json

@@ -11,7 +11,7 @@
     },
     "dependencies": {
         "@astrojs/check": "0.9.4",
-        "@astrojs/starlight": "0.28.2",
+        "@astrojs/starlight": "0.28.3",
         "astro": "4.16.0",
         "sharp": "0.33.5",
         "typescript": "5.6.3"