Bump rewriter from 1ce9f1a to aad1a9b

Bumps [rewriter](https://github.com/mit-plv/rewriter) from `1ce9f1a` to `aad1a9b`.
- [Release notes](https://github.com/mit-plv/rewriter/releases)
- [Commits](mit-plv/rewriter@1ce9f1a...aad1a9b)

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

Signed-off-by: dependabot[bot] <[email protected]>