chore(deps): bump next from 7.0.2 to 12.1.0

Bumps [next](https://github.com/vercel/next.js) from 7.0.2 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@7.0.2...v12.1.0)

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

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

Author: dependabot[bot]

package.json

@@ -27,7 +27,7 @@
     "markdown-it-toc-done-right": "^4.0.1",
     "md-it-meta": "^0.0.2",
     "msgpack-lite": "^0.1.26",
-    "next": "^7.0.2",
+    "next": "^12.1.0",
     "next-routes": "^1.4.2",
     "plantuml-encoder": "^1.4.0",
     "react": "^16.5.2",