build(deps): bump golang.org/x/sync from 0.8.0 to 0.9.0 (#14432)

Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.8.0 to
0.9.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/golang/sync/commit/151027eb5637d626749783009eab9f0a7cfb446a"><code>151027e</code></a>
README: don't recommend go get</li>
<li>See full diff in <a
href="https://github.com/golang/sync/compare/v0.8.0...v0.9.0">compare
view</a></li>
</ul>
</details>
<br />


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</details>