Bump next from 11.1.2 to 12.0.0 (#349)

Bumps [next](https://github.com/vercel/next.js) from 11.1.2 to 12.0.0.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v11.1.2...v12.0.0)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

web/package.json

@@ -17,7 +17,7 @@
     "date-fns": "^2.25.0",
     "lodash": "^4.17.21",
     "markdown-it": "^12.2.0",
-    "next": "^11.1.2",
+    "next": "^12.0.0",
     "prop-types": "^15.7.2",
     "rc-util": "^5.14.0",
     "react": "^17.0.2",