Bump third-party/verilator/master from 6f055f8 to f9c5db9 (#883)

Bumps [third-party/verilator/master](https://github.com/verilator/verilator) from `6f055f8` to `f9c5db9`.
- [Commits](verilator/verilator@6f055f8...f9c5db9)

---
updated-dependencies:
- dependency-name: third-party/verilator/master
  dependency-version: f9c5db907affb5b548c0a644bf122521dc03d798
  dependency-type: direct:production
...

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

Author: dependabot[bot]