build(deps): bump third_party/tools/yosys from 9f7cdd4 to ac96f31

Bumps [third_party/tools/yosys](https://github.com/YosysHQ/yosys) from `9f7cdd4` to `ac96f31`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@9f7cdd4...ac96f31)

---
updated-dependencies:
- dependency-name: third_party/tools/yosys
  dependency-version: ac96f318eff51fc5593a9d3c9019403d226ec12b
  dependency-type: direct:production
...

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Author: dependabot[bot]