MINOR: [C#] Bump ZstdSharp.Port from 0.8.3 to 0.8.4 in /csharp (apache#45037)

Bumps [ZstdSharp.Port](https://github.com/oleg-st/ZstdSharp) from 0.8.3 to 0.8.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/oleg-st/ZstdSharp/releases">ZstdSharp.Port's releases</a>.</em></p>
<blockquote>
<h2>0.8.4</h2>
<p>Fixed compression on x86 <a href="https://redirect.github.com/oleg-st/ZstdSharp/issues/48">#48</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/b66b28d40a67cd40b5876f8e9b8aaeb591683fc4"><code>b66b28d</code></a> 0.8.4</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/33c1fc8d18be6388ac57973cc3ad8390d1b1728d"><code>33c1fc8</code></a> Fixed HUF_CTableHeader size depending on architecture</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/5de65fd620c8779bef9a118ee41cc07785d64dce"><code>5de65fd</code></a> Added x86 libzstd to Zstd.Extern project</li>
<li>See full diff in <a href="https://github.com/oleg-st/ZstdSharp/compare/0.8.3...0.8.4">compare view</a></li>
</ul>
</details>
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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Curt Hagenlocher <[email protected]>

Author: dependabot[bot]

csharp/src/Apache.Arrow.Compression/Apache.Arrow.Compression.csproj

@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="K4os.Compression.LZ4.Streams" Version="1.3.8" />
-    <PackageReference Include="ZstdSharp.Port" Version="0.8.3" />
+    <PackageReference Include="ZstdSharp.Port" Version="0.8.4" />
   </ItemGroup>
 
   <ItemGroup>