MINOR: [C#] Bump ZstdSharp.Port and System.Runtime.CompilerServices.U…

…nsafe in /csharp (#41742)

Bumps [ZstdSharp.Port](https://github.com/oleg-st/ZstdSharp) and [System.Runtime.CompilerServices.Unsafe](https://github.com/dotnet/runtime). These dependencies needed to be updated together.
Updates `ZstdSharp.Port` from 0.8.0 to 0.8.1
<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>0.8.1</h2>
<p>Better decompression speed in .NET 8 (~5%)</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/f8ec37192fa4037b6580a80ce83c5a7664a322f7"><code>f8ec371</code></a> 0.8.1</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/cba789660040fed750591cc47c658a47e601698c"><code>cba7896</code></a> Comments</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/2b219c94e2d9786103b5d620315e3d9b904dc21d"><code>2b219c9</code></a> Structs initialization</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/0cbf8428e3f33534e95aea1a7469d9e0b50e5bbb"><code>0cbf842</code></a> Constant conditional operators with shifts</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/0b0d269626c59c79bdf21fec3f4b5291a4c8ff3f"><code>0b0d269</code></a> Better decompression performance for .NET 8+</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/00ddc6e8c99d2799143d58395c469edbb1c9b283"><code>00ddc6e</code></a> Constant conditional operators</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/b39ebfa0b9769ff26ef3f37cc832b7cc62bb91d7"><code>b39ebfa</code></a> Using NativeMemory</li>
<li><a href="https://github.com/oleg-st/ZstdSharp/commit/cc9aa9ed9448fe1ad0ec1630ed2e862e50d63094"><code>cc9aa9e</code></a> Update README.md</li>
<li>See full diff in <a href="https://github.com/oleg-st/ZstdSharp/compare/0.8.0...0.8.1">compare view</a></li>
</ul>
</details>
<br />

Updates `System.Runtime.CompilerServices.Unsafe` from 4.7.1 to 6.0.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dotnet/runtime/releases">System.Runtime.CompilerServices.Unsafe's releases</a>.</em></p>
<blockquote>
<h2>.NET 6.0</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0">Release</a></p>
<h2>.NET 6.0 RC 2</h2>
<p><a href="https://github.com/dotnet/core/tree/v6.0.0-rc.2">Release</a></p>
<h2>.NET 6.0 RC 1</h2>
<p><a href="https://github.com/dotnet/core/tree/v6.0.0-rc.1">Release</a></p>
<h2>.NET 6.0 Preview 7</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0-preview.7">Release</a></p>
<h2>.NET 6.0 Preview 6</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0-preview.6">Release</a></p>
<h2>.NET 6.0 Preview 5</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0-preview.5">Release</a></p>
<h2>.NET 6.0 Preview 4</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0-preview.4">Release</a></p>
<h2>.NET 6.0 Preview 3</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0-preview.3">Release</a></p>
<h2>.NET 6.0 Preview 2</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0-preview.2">Release</a></p>
<h2>.NET 6.0 Preview 1</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v6.0.0-preview.1">Release</a></p>
<h2>.NET 5.0.17</h2>
<p><a href="https://github.com/dotnet/core/tree/v5.0.17">Release</a></p>
<p>.NET 5 is now <a href="https://docs.microsoft.com/en-us/lifecycle/products/microsoft-net-and-net-core">out of support</a>. We recommend using .NET 6.</p>
<h2>.NET 5.0.16</h2>
<p><a href="https://github.com/dotnet/core/tree/v5.0.16">Release</a></p>
<h2>.NET 5.0.15</h2>
<p><a href="https://github.com/dotnet/core/tree/v5.0.15">Release</a></p>
<h2>.NET 5.0.14</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v5.0.14">Release</a></p>
<h2>.NET 5.0.13</h2>
<p><a href="https://github.com/dotnet/core/releases/tag/v5.0.13">Release</a></p>
<h2>.NET 5.0.11</h2>
<p><a href="https://github.com/dotnet/core/tree/v5.0.11">Release</a></p>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/dotnet/runtime/commits/v6.0.0">compare view</a></li>
</ul>
</details>
<br />

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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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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="0.8.0" />
+    <PackageReference Include="ZstdSharp.Port" Version="0.8.1" />
   </ItemGroup>
 
   <ItemGroup>