Bump yosys from cbd3ff2 to 4a475fa

Bumps [yosys](https://github.com/YosysHQ/yosys) from `cbd3ff2` to `4a475fa`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@cbd3ff2...4a475fa)

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

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