chore(deps): bump fumadocs-core from 16.4.11 to 16.6.8

Bumps [fumadocs-core](https://github.com/fuma-nama/fumadocs) from 16.4.11 to 16.6.8.
- [Release notes](https://github.com/fuma-nama/fumadocs/releases)
- [Commits](https://github.com/fuma-nama/fumadocs/compare/fumadocs-core@16.4.11...fumadocs-core@16.6.8)

---
updated-dependencies:
- dependency-name: fumadocs-core
  dependency-version: 16.6.8
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

apps/site/package.json

@@ -10,7 +10,7 @@
     "lint": "echo 'Lint: site excluded (see eslint.config.mjs ignores)'"
   },
   "dependencies": {
-    "fumadocs-core": "^16.4.11",
+    "fumadocs-core": "^16.6.8",
     "fumadocs-docgen": "^3.0.7",
     "fumadocs-mdx": "^14.2.8",
     "fumadocs-twoslash": "^3.1.13",