Bump next from 10.2.0 to 11.1.1 in /site

Bumps [next](https://github.com/vercel/next.js) from 10.2.0 to 11.1.1.
- [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/compare/v10.2.0...v11.1.1)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
...

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

site/package.json

@@ -15,7 +15,7 @@
     "autoprefixer": "^10.0.4",
     "frictionless.js": "^0.13.4",
     "gray-matter": "^4.0.3",
-    "next": "10.2.0",
+    "next": "11.1.1",
     "next-mdx-remote": "^3.0.4",
     "papaparse": "^5.3.1",
     "postcss": "^8.2.10",