Bump rewriter from 1ce9f1a to 76973c4 (#1975)

Bumps [rewriter](https://github.com/mit-plv/rewriter) from `1ce9f1a` to `76973c4`.
- [Release notes](https://github.com/mit-plv/rewriter/releases)
- [Commits](mit-plv/rewriter@1ce9f1a...76973c4)

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

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