Bump third-party/verilator/master from 5c0ad5b to 43975bc

Bumps [third-party/verilator/master](https://github.com/verilator/verilator) from `5c0ad5b` to `43975bc`.
- [Commits](verilator/verilator@5c0ad5b...43975bc)

---
updated-dependencies:
- dependency-name: third-party/verilator/master
  dependency-version: 43975bcbdd65c06de7798ccd0e6825d2993f1897
  dependency-type: direct:production
...

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

Author: dependabot[bot]