chore(deps): Bump next from 9.4.1 to 12.1.0

Bumps [next](https://github.com/vercel/next.js) from 9.4.1 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@v9.4.1...v12.1.0)

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

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

package.json

@@ -127,7 +127,7 @@
     "keymirror": "~0.1.1",
     "lodash": "~4.17.20",
     "mdi-material-ui": "~5.33.1",
-    "next": "9.4.1",
+    "next": "12.1.0",
     "passport": "~0.4.0",
     "passport-oauth2": "~1.4.0",
     "prop-types": "^15.7.2",