Bump rewriter from 4b028fc to 9496def (#2073)

Bumps [rewriter](https://github.com/mit-plv/rewriter) from `4b028fc` to `9496def`.
- [Release notes](https://github.com/mit-plv/rewriter/releases)
- [Commits](mit-plv/rewriter@4b028fc...9496def)

---
updated-dependencies:
- dependency-name: rewriter
  dependency-version: 9496defb8b236f442d11372f6e0b5e48aa38acfc
  dependency-type: direct:production
...

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Author: dependabot[bot]