build(deps): bump third_party/yosys from 8e1e2b9 to 1bf908d

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from `8e1e2b9` to `1bf908d`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@8e1e2b9...1bf908d)

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

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