Bump next from 12.3.4 to 14.2.21

Bumps [next](https://github.com/vercel/next.js) from 12.3.4 to 14.2.21.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v12.3.4...v14.2.21)

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

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

Author: dependabot[bot]

playgrounds/next-playground/package.json

@@ -16,7 +16,7 @@
     "@segment/analytics-next": "workspace:^",
     "faker": "^5.1.0",
     "lodash": "^4.17.21",
-    "next": "^12.1.0",
+    "next": "^14.2.21",
     "prismjs": "^1.27.0",
     "rc-table": "^7.10.0",
     "react": "^17.0.2",