chore(deps): bump next and react-email in /react-email-preview

Bumps [next](https://github.com/vercel/next.js) to 14.1.4 and updates ancestor dependency [react-email](https://github.com/resend/react-email/tree/HEAD/packages/react-email). These dependencies need to be updated together.


Updates `next` from 14.1.0 to 14.1.4
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v14.1.0...v14.1.4)

Updates `react-email` from 2.1.0 to 2.1.4
- [Release notes](https://github.com/resend/react-email/releases)
- [Commits](https://github.com/resend/react-email/commits/[email protected]/packages/react-email)

---
updated-dependencies:
- dependency-name: next
  dependency-type: indirect
- dependency-name: react-email
  dependency-type: direct:production
...

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