build(deps): bump third_party/tools/yosys from 9f7cdd4 to 1ccbd21

Bumps [third_party/tools/yosys](https://github.com/YosysHQ/yosys) from `9f7cdd4` to `1ccbd21`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@9f7cdd4...1ccbd21)

---
updated-dependencies:
- dependency-name: third_party/tools/yosys
  dependency-version: 1ccbd21ed8d85895d4153227f2cd5160c63dbd9c
  dependency-type: direct:production
...

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

Author: dependabot[bot]