build(deps): bump third_party/yosys from `17a53b8` to `502c39b` (#2482)

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from `17a53b8` to `502c39b`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](https://github.com/YosysHQ/yosys/compare/17a53b83852886654a781eb9238e528d9c52484d...502c39b875f788bae422047fbbc06f2ef5fc17f0)

---
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 17a53b8..502c39b 160000
--- a/third_party/yosys
+++ b/third_party/yosys
@@ -1 +1 @@
-Subproject commit 17a53b83852886654a781eb9238e528d9c52484d
+Subproject commit 502c39b875f788bae422047fbbc06f2ef5fc17f0