Bump next from 11.1.3 to 12.1.0 in /examples/ssr-next (#1410)

Bumps [next](https://github.com/vercel/next.js) from 11.1.3 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@v11.1.3...v12.1.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

examples/ssr-next/package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "evergreen-ui": "latest",
-    "next": "^11.1.3",
+    "next": "^12.1.0",
     "react": "^16.5.2",
     "react-dom": "^16.5.2"
   },