Bump extern/yaml-cpp from 1d8ca1f to b95aa14 (#692)

Bumps [extern/yaml-cpp](https://github.com/jbeder/yaml-cpp) from
`1d8ca1f` to `b95aa14`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/jbeder/yaml-cpp/commit/b95aa146ec3226f31b7b75bef1b5f750af25fb8a"><code>b95aa14</code></a>
fix: use C locale by default</li>
<li>See full diff in <a
href="https://github.com/jbeder/yaml-cpp/compare/1d8ca1f35eb3a9c9142462b28282a848e5d29a91...b95aa146ec3226f31b7b75bef1b5f750af25fb8a">compare
view</a></li>
</ul>
</details>
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