Bump extern/yaml-cpp from a83cd31 to c7aa78d (#1554)

Bumps [extern/yaml-cpp](https://github.com/jbeder/yaml-cpp) from
`a83cd31` to `c7aa78d`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/jbeder/yaml-cpp/commit/c7aa78d294bbe499c1ebc0abfa1e103490c8525f"><code>c7aa78d</code></a>
fix: overflow buffer with large precision values</li>
<li><a
href="https://github.com/jbeder/yaml-cpp/commit/a2826e898323c206ac54c1781040e0eefd19468a"><code>a2826e8</code></a>
fix: unittests sets locale before testing</li>
<li><a
href="https://github.com/jbeder/yaml-cpp/commit/bbf8bdb087bb3f3621ca0a5ace06047805f4e9f3"><code>bbf8bdb</code></a>
Bump actions/checkout from 5 to 6 in the github-actions group</li>
<li>See full diff in <a
href="https://github.com/jbeder/yaml-cpp/compare/a83cd31548b19d50f3f983b069dceb4f4d50756d...c7aa78d294bbe499c1ebc0abfa1e103490c8525f">compare
view</a></li>
</ul>
</details>
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