build(deps): bump third_party/sby from `fa5d5ad` to `26b3874`

Bumps [third_party/sby](https://github.com/YosysHQ/sby) from `fa5d5ad` to `26b3874`.
- [Commits](https://github.com/YosysHQ/sby/compare/fa5d5ad831dcbea08ea1d9d6ff81df697183eaa1...26b387466d224cd9e83a6f97d0b69d9dd59e56b5)

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

Signed-off-by: dependabot[bot] <support@github.com>

third_party/sby

diff --git a/third_party/sby b/third_party/sby
index fa5d5ad..26b3874 160000
--- a/third_party/sby
+++ b/third_party/sby
@@ -1 +1 @@
-Subproject commit fa5d5ad831dcbea08ea1d9d6ff81df697183eaa1
+Subproject commit 26b387466d224cd9e83a6f97d0b69d9dd59e56b5