Bump golang.org/x/sync from 0.12.0 to 0.13.0 (#5)

Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.12.0 to
0.13.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/golang/sync/commit/396f3a06ea2a49eb410f12e244c0dd77095d0de9"><code>396f3a0</code></a>
errgroup: document calling Go before Wait</li>
<li>See full diff in <a
href="https://github.com/golang/sync/compare/v0.12.0...v0.13.0">compare
view</a></li>
</ul>
</details>
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