Bump @next/mdx from 13.0.0 to 14.0.3

Bumps [@next/mdx](https://github.com/vercel/next.js/tree/HEAD/packages/next-mdx) from 13.0.0 to 14.0.3.
- [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/v14.0.3/packages/next-mdx)

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

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

package.json

@@ -22,7 +22,7 @@
     "@lhci/cli": "^0.10.0",
     "@mdx-js/loader": "^2.1.3",
     "@mdx-js/react": "^3.0.0",
-    "@next/mdx": "^13.0.0",
+    "@next/mdx": "^14.0.3",
     "@playwright/test": "^1.25.0",
     "@storybook/addon-actions": "^7.0.2",
     "@storybook/addon-essentials": "^7.5.0",