Bump yosys from 669f8b1 to 77b2ae2

Bumps [yosys](https://github.com/YosysHQ/yosys) from `669f8b1` to `77b2ae2`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@669f8b1...77b2ae2)

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

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