Bump rewriter from edd0611 to 8ab716a (#1988)

Bumps [rewriter](https://github.com/mit-plv/rewriter) from `edd0611` to `8ab716a`.
- [Release notes](https://github.com/mit-plv/rewriter/releases)
- [Commits](mit-plv/rewriter@edd0611...8ab716a)

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

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