Build(deps): Bump third_party/yosys from 98b4aff to 6f3376c (#2684)

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from
`98b4aff` to `6f3376c`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/YosysHQ/yosys/commit/6f3376cbe6dbd1e1513facc28930e837798c94e3"><code>6f3376c</code></a>
Merge pull request <a
href="https://redirect.github.com/YosysHQ/yosys/issues/4730">#4730</a>
from YosysHQ/krys/downstream-docs</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/87742fa688cec95ceb089475726bc2404910ee36"><code>87742fa</code></a>
Bump version</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/646c5a19a88f8e64a4b81ab503f8199d52a06c8d"><code>646c5a1</code></a>
Merge pull request <a
href="https://redirect.github.com/YosysHQ/yosys/issues/4776">#4776</a>
from YosysHQ/krys/get_blackbox_attribute</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/1717a0b9c05d4ddd7cf75f1d09fa297adeec20ca"><code>1717a0b</code></a>
Merge pull request <a
href="https://redirect.github.com/YosysHQ/yosys/issues/4721">#4721</a>
from ldoolitt/main</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/956313efe80aea2303073a2b27ac1b64476d2edf"><code>956313e</code></a>
Merge pull request <a
href="https://redirect.github.com/YosysHQ/yosys/issues/4742">#4742</a>
from YosysHQ/hierarchy_notify_top_attr</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/3bab837bc97e6f5e27bef231762e9936f15feeb5"><code>3bab837</code></a>
Merge pull request <a
href="https://redirect.github.com/YosysHQ/yosys/issues/4765">#4765</a>
from georgerennie/george/rtlil_case_rule</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/698c464109792f30fc58ad12a671b58b54e499b9"><code>698c464</code></a>
Merge pull request <a
href="https://redirect.github.com/YosysHQ/yosys/issues/4767">#4767</a>
from YosysHQ/krys/latest-compilers</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/f42816325217e16169abaf135e639e04490a55ad"><code>f428163</code></a>
Move get_blackbox_attribute method to Module instead of AttrObject</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/1e0e367aeda8760407bd8efd81e85580a074ae19"><code>1e0e367</code></a>
test-compile: Drop back to gcc-13</li>
<li><a
href="https://github.com/YosysHQ/yosys/commit/6ff5823d6a63bdb093584446ff3983f3c2b38761"><code>6ff5823</code></a>
test-compile: Use clang-18 and gcc-14</li>
<li>Additional commits viewable in <a
href="https://github.com/YosysHQ/yosys/compare/98b4affc4a03d65e2fb3e0854f2e916e3f75e5d6...6f3376cbe6dbd1e1513facc28930e837798c94e3">compare
view</a></li>
</ul>
</details>
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</details>