Build(deps): Bump third_party/yosys from 80ba43d to 669f8b1 (#2511)

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from
`80ba43d` to `669f8b1`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/YosysHQ/yosys/commit/669f8b18f07ce9b3370eb017ed7f6189704ddad1"><code>669f8b1</code></a>
Bump version</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/d08bf671b21f50e8def44955feed09407541b9bd"><code>d08bf67</code></a>
Next dev cycle</li>
<li>See full diff in <a
href="https://github.com/YosysHQ/yosys/compare/80ba43d26264738c93900129dc0aab7fab36c53f...669f8b18f07ce9b3370eb017ed7f6189704ddad1">compare
view</a></li>
</ul>
</details>
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</details>