Bump submodules/protobuf from ca7499c to 4b159e0 (#248)

Bumps [submodules/protobuf](https://github.com/Jelly-RDF/jelly-protobuf)
from `ca7499c` to `4b159e0`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/Jelly-RDF/jelly-protobuf/commit/4b159e01a92560fb38e619f670b2ae1f0ea20ee5"><code>4b159e0</code></a>
fix missing result files in from_jelly/graphs_rdf_star/pos_007 (<a
href="https://redirect.github.com/Jelly-RDF/jelly-protobuf/issues/90">#90</a>)</li>
<li>See full diff in <a
href="https://github.com/Jelly-RDF/jelly-protobuf/compare/ca7499cd2ac38aad2799cb739e740d771be1e750...4b159e01a92560fb38e619f670b2ae1f0ea20ee5">compare
view</a></li>
</ul>
</details>
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