MINOR: [C#] Bump ZstdSharp.Port from 0.8.4 to 0.8.5 in /csharp (#45655)

Bumps [ZstdSharp.Port](https://github.com/oleg-st/ZstdSharp) from 0.8.4 to 0.8.5.
<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>0.8.5</h2>
<p>Ported zstd v1.5.7</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/033a60cc132a437ff64467fd0a531b45638ce2f2"><code>033a60c</code></a> 0.8.5</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/83cd9776badd75e79cc27086035af4adeadda21b"><code>83cd977</code></a> Ported zstd v1.5.7</li>
<li>See full diff in <a href="https://github.com/oleg-st/ZstdSharp/compare/0.8.4...0.8.5">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: Curt Hagenlocher <[email protected]>

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="0.8.4" />
+    <PackageReference Include="ZstdSharp.Port" Version="0.8.5" />
   </ItemGroup>
 
   <ItemGroup>