Build(deps): Bump third_party/sby from daed0e1 to 26b3874 (#2640)

Bumps [third_party/sby](https://github.com/YosysHQ/sby) from `daed0e1`
to `26b3874`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/YosysHQ/sby/commit/26b387466d224cd9e83a6f97d0b69d9dd59e56b5"><code>26b3874</code></a>
Merge pull request <a
href="https://redirect.github.com/YosysHQ/sby/issues/308">#308</a> from
YosysHQ/krys/drop_ilang</li>
<li><a
href="https://github.com/YosysHQ/sby/commit/176e59c3d8c9faf5ecde681f71a62e95abd4f3ec"><code>176e59c</code></a>
Replace (read_)ilang with (read_)rtlil</li>
<li>See full diff in <a
href="https://github.com/YosysHQ/sby/compare/daed0e1544fd96ee7dab843e5a891d92784c6230...26b387466d224cd9e83a6f97d0b69d9dd59e56b5">compare
view</a></li>
</ul>
</details>
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</details>