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MINOR: [Go] Bump github.com/hamba/avro/v2 from 2.20.0 to 2.20.1 in /go (#40637)

Bumps [github.com/hamba/avro/v2](https://github.com/hamba/avro) from 2.20.0 to 2.20.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/hamba/avro/releases">github.com/hamba/avro/v2's releases</a>.</em></p>
<blockquote>
<h2>v2.20.1</h2>
<h2>What's Changed</h2>
<ul>
<li>fix: union reader schema resolution by <a href="https://github.com/redaLaanait"><code>@​redaLaanait</code></a> in <a href="https://redirect.github.com/hamba/avro/pull/358">hamba/avro#358</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/hamba/avro/compare/v2.20.0...v2.20.1">https://github.com/hamba/avro/compare/v2.20.0...v2.20.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/hamba/avro/commit/1cb8acd0ae81d79ea2e80d50456ee60689ad6895"><code>1cb8acd</code></a> fix: union reader schema resolution (<a href="https://redirect.github.com/hamba/avro/issues/358">#358</a>)</li>
<li><a href="https://github.com/hamba/avro/commit/979cff33f173469348a6b822fdbd2f9d866491a5"><code>979cff3</code></a> chore: bump the all group with 1 update (<a href="https://redirect.github.com/hamba/avro/issues/356">#356</a>)</li>
<li><a href="https://github.com/hamba/avro/commit/35405ff53669e046baae7f8627cbcc037c084562"><code>35405ff</code></a> chore: bump the all group with 1 update (<a href="https://redirect.github.com/hamba/avro/issues/351">#351</a>)</li>
<li><a href="https://github.com/hamba/avro/commit/93f2a49014d31108e85d3c69993e7ef45970e427"><code>93f2a49</code></a> chore: bump the all group with 1 update (<a href="https://redirect.github.com/hamba/avro/issues/355">#355</a>)</li>
<li>See full diff in <a href="https://github.com/hamba/avro/compare/v2.20.0...v2.20.1">compare view</a></li>
</ul>
</details>
<br />

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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>