Bump next from 8.0.3 to 9.3.2

Bumps [next](https://github.com/zeit/next.js) from 8.0.3 to 9.3.2.
- [Release notes](https://github.com/zeit/next.js/releases)
- [Commits](vercel/next.js@v8.0.3...v9.3.2)

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Author: dependabot[bot]