build(deps): bump third_party/yosys from `e6021b2` to `70d3531` (#2283)

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from `e6021b2` to `70d3531`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](https://github.com/YosysHQ/yosys/compare/e6021b2b485bcff9953f5fbd83595348a7adc84c...70d35314dbd7521870047ed607897f22dc48cbc3)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/third_party/yosys b/third_party/yosys
index e6021b2..70d3531 160000
--- a/third_party/yosys
+++ b/third_party/yosys
@@ -1 +1 @@
-Subproject commit e6021b2b485bcff9953f5fbd83595348a7adc84c
+Subproject commit 70d35314dbd7521870047ed607897f22dc48cbc3