Bump extern/yaml-cpp from 47cd272 to da82fd9 (#763)

Bumps [extern/yaml-cpp](https://github.com/jbeder/yaml-cpp) from
`47cd272` to `da82fd9`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/jbeder/yaml-cpp/commit/da82fd982c260e7f335ce5acbceff24b270544d1"><code>da82fd9</code></a>
chore(test/integration): refactor some test cases to their own
test.</li>
<li><a
href="https://github.com/jbeder/yaml-cpp/commit/1f2b841949de53366508d44e59a6d5bbac562fa3"><code>1f2b841</code></a>
fix(src,include,test): fixed multiple cases where a bad yaml was
accepted.</li>
<li>See full diff in <a
href="https://github.com/jbeder/yaml-cpp/compare/47cd2725d61e54719933b83ea51c64ad60c24066...da82fd982c260e7f335ce5acbceff24b270544d1">compare
view</a></li>
</ul>
</details>
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