build(deps): bump third_party/yosys from ea7818d to df65634 (f4pg…

…a#2296)

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from `ea7818d` to `df65634`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](YosysHQ/yosys@ea7818d...df65634)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>