build(deps): bump fumadocs-ui from 15.6.3 to 15.6.9

Bumps [fumadocs-ui](https://github.com/fuma-nama/fumadocs) from 15.6.3 to 15.6.9.
- [Release notes](https://github.com/fuma-nama/fumadocs/releases)
- [Commits](https://github.com/fuma-nama/fumadocs/compare/fumadocs-ui@15.6.3...fumadocs-ui@15.6.9)

---
updated-dependencies:
- dependency-name: fumadocs-ui
  dependency-version: 15.6.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -16,7 +16,7 @@
     "@types/mdx": "^2.0.13",
     "fumadocs-core": "^15.6.9",
     "fumadocs-mdx": "^11.7.4",
-    "fumadocs-ui": "^15.6.3",
+    "fumadocs-ui": "^15.6.9",
     "lucide-react": "^0.525.0",
     "mdx": "^0.3.1",
     "next": "^15.4.5",