Bump rewriter from 90549d8 to 604362b

Bumps [rewriter](https://github.com/mit-plv/rewriter) from `90549d8` to `604362b`.
- [Release notes](https://github.com/mit-plv/rewriter/releases)
- [Commits](mit-plv/rewriter@90549d8...604362b)

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

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