MINOR: [Go] Bump golang.org/x/sync from 0.6.0 to 0.7.0 in /go (apache…

…#41079)

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[//]: # (dependabot-end)

Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.6.0 to 0.7.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/golang/sync/commit/14be23e5b48bec28285f8a694875175ecacfddb3"><code>14be23e</code></a> semaphore: cancel acquisition with a done context</li>
<li>See full diff in <a href="https://github.com/golang/sync/compare/v0.6.0...v0.7.0">compare view</a></li>
</ul>
</details>
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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>