chore(deps)(deps-dev): bump @next/mdx from 15.5.4 to 16.0.3

Bumps [@next/mdx](https://github.com/vercel/next.js/tree/HEAD/packages/next-mdx) from 15.5.4 to 16.0.3.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v16.0.3/packages/next-mdx)

---
updated-dependencies:
- dependency-name: "@next/mdx"
  dependency-version: 16.0.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -48,7 +48,7 @@
     "@cspell/dict-de-de": "^4.1.2",
     "@mdx-js/loader": "^3.1.1",
     "@next/bundle-analyzer": "^15.5.5",
-    "@next/mdx": "^15.5.4",
+    "@next/mdx": "^16.0.3",
     "@tailwindcss/postcss": "^4.1.17",
     "@types/mdx": "^2.0.13",
     "@types/node": "^20.19.25",