Bump next from 11.1.2 to 12.1.0

Bumps [next](https://github.com/vercel/next.js) from 11.1.2 to 12.1.0.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v11.1.2...v12.1.0)

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

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

package.json

@@ -14,7 +14,7 @@
     "flag-icon-css": "^3.5.0",
     "font-awesome": "^4.7.0",
     "leaflet": "^1.7.1",
-    "next": "11.1.2",
+    "next": "12.1.0",
     "plaiceholder": "^2.0.1",
     "react": "17.0.2",
     "react-blurhash": "^0.1.3",