Bumps [deps/googletest](https://github.com/google/googletest) from
`4902ea2` to `3af8347`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="3af834740f"><code>3af8347</code></a>
Improve the failure messages of <code>ElementsAre()</code>,
<code>ElementsAreArray()</code>, etc.</li>
<li>See full diff in <a
href="4902ea2d7c...3af834740f">compare
view</a></li>
</ul>
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