Bump third-party/verilator/master from 220a3fa to f1396fb (#851)

Bumps [third-party/verilator/master](https://github.com/verilator/verilator) from `220a3fa` to `f1396fb`.
- [Commits](verilator/verilator@220a3fa...f1396fb)

---
updated-dependencies:
- dependency-name: third-party/verilator/master
  dependency-version: f1396fbced361b8a8d3339372cc0aa863eb8928a
  dependency-type: direct:production
...

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

Author: dependabot[bot]