build(deps): bump third_party/yosys from 118b282 to c788484

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from `118b282` to `c788484`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@118b282...c788484)

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

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