Bump rewriter from 76973c4 to e4d987c

Bumps [rewriter](https://github.com/mit-plv/rewriter) from `76973c4` to `e4d987c`.
- [Release notes](https://github.com/mit-plv/rewriter/releases)
- [Commits](mit-plv/rewriter@76973c4...e4d987c)

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

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