Bump next from 7.0.2 to 9.3.2

Bumps [next](https://github.com/zeit/next.js) from 7.0.2 to 9.3.2.
- [Release notes](https://github.com/zeit/next.js/releases)
- [Commits](vercel/next.js@7.0.2...v9.3.2)

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Author: dependabot[bot]