Bump third-party/verilator/master from 3b0db63 to afc4bed (#916)

Bumps [third-party/verilator/master](https://github.com/verilator/verilator) from `3b0db63` to `afc4bed`.
- [Commits](verilator/verilator@3b0db63...afc4bed)

---
updated-dependencies:
- dependency-name: third-party/verilator/master
  dependency-version: afc4bed0f82e1178dbda3bffac865916258cb00e
  dependency-type: direct:production
...

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

Author: dependabot[bot]