Bump third-party/verilator/master from b794c7c to 28ee2eb (#862)

Bumps [third-party/verilator/master](https://github.com/verilator/verilator) from `b794c7c` to `28ee2eb`.
- [Commits](verilator/verilator@b794c7c...28ee2eb)

---
updated-dependencies:
- dependency-name: third-party/verilator/master
  dependency-version: 28ee2ebb30a7e1651c1db812370a66979a782330
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]