build(deps): bump third_party/tools/icarus from 52d049b to 676b36e

Bumps [third_party/tools/icarus](https://github.com/steveicarus/iverilog) from `52d049b` to `676b36e`.
- [Release notes](https://github.com/steveicarus/iverilog/releases)
- [Commits](steveicarus/iverilog@52d049b...676b36e)

---
updated-dependencies:
- dependency-name: third_party/tools/icarus
  dependency-type: direct:production
...

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