MINOR: [C#] Bump Grpc.Net.Client and System.Runtime.CompilerServices.…

…Unsafe in /csharp (#43475)

Bumps [Grpc.Net.Client](https://github.com/grpc/grpc-dotnet) and [System.Runtime.CompilerServices.Unsafe](https://github.com/dotnet/runtime). These dependencies needed to be updated together.
Updates `Grpc.Net.Client` from 2.64.0 to 2.65.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/grpc/grpc-dotnet/releases">Grpc.Net.Client's releases</a>.</em></p>
<blockquote>
<h2>Release v2.65.0-pre1</h2>
<h2>What's Changed</h2>
<ul>
<li>Update Native.DetectWindowsVersion() to consider Windows Server 2019 to be Window Server by <a href="https://github.com/wrall"><code>@​wrall</code></a> in <a href="https://redirect.github.com/grpc/grpc-dotnet/pull/2468">grpc/grpc-dotnet#2468</a></li>
<li>Bump master version to 2.65.0-dev by <a href="https://github.com/stanley-cheung"><code>@​stanley-cheung</code></a> in <a href="https://redirect.github.com/grpc/grpc-dotnet/pull/2472">grpc/grpc-dotnet#2472</a></li>
<li>Reduce usage of RunContinuationsAsynchronously by <a href="https://github.com/JamesNK"><code>@​JamesNK</code></a> in <a href="https://redirect.github.com/grpc/grpc-dotnet/pull/2478">grpc/grpc-dotnet#2478</a></li>
<li>Bump Grpc.Tools version to 2.65.0 by <a href="https://github.com/stanley-cheung"><code>@​stanley-cheung</code></a> in <a href="https://redirect.github.com/grpc/grpc-dotnet/pull/2488">grpc/grpc-dotnet#2488</a></li>
<li>Bump version to 2.65.0-pre1 by <a href="https://github.com/stanley-cheung"><code>@​stanley-cheung</code></a> in <a href="https://redirect.github.com/grpc/grpc-dotnet/pull/2490">grpc/grpc-dotnet#2490</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/wrall"><code>@​wrall</code></a> made their first contribution in <a href="https://redirect.github.com/grpc/grpc-dotnet/pull/2468">grpc/grpc-dotnet#2468</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/grpc/grpc-dotnet/compare/v2.64.0...v2.65.0-pre1">https://github.com/grpc/grpc-dotnet/compare/v2.64.0...v2.65.0-pre1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/grpc/grpc-dotnet/commits">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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csharp/src/Apache.Arrow.Flight/Apache.Arrow.Flight.csproj

@@ -6,7 +6,7 @@
 
   <ItemGroup>
     <PackageReference Include="Google.Protobuf" Version="3.27.2" />
-    <PackageReference Include="Grpc.Net.Client" Version="2.64.0" />
+    <PackageReference Include="Grpc.Net.Client" Version="2.65.0" />
     <PackageReference Include="Grpc.Tools" Version="2.65.0" PrivateAssets="All" />
   </ItemGroup>