Bump next from 10.0.3 to 12.1.0 in /client

Bumps [next](https://github.com/vercel/next.js) from 10.0.3 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@v10.0.3...v12.1.0)

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

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

Author: dependabot[bot]

client/package.json

@@ -19,7 +19,7 @@
     "feathers-offline-realtime": "^0.1.2",
     "feathers-redux": "^3.0.0",
     "moment": "2.29.1",
-    "next": "10.0.3",
+    "next": "12.1.0",
     "next-compose-plugins": "2.2.0",
     "next-env": "^1.1.1",
     "next-images": "1.3.1",