Bump NuGet.Protocol in /test/Microsoft.Windows.CsWin32.Tests (#741)

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client) from 5.8.0 to 5.9.3.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

---
updated-dependencies:
- dependency-name: NuGet.Protocol
  dependency-type: direct:production
...

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test/Microsoft.Windows.CsWin32.Tests/Microsoft.Windows.CsWin32.Tests.csproj

@@ -41,7 +41,7 @@
     <PackageReference Include="MessagePack" Version="2.2.85" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.10.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.SourceGenerators.Testing.XUnit" Version="1.1.1" />
-    <PackageReference Include="NuGet.Protocol" Version="5.8.0" />
+    <PackageReference Include="NuGet.Protocol" Version="5.9.3" />
     <!-- <PackageReference Include="Microsoft.Dia.Win32Metadata" Version="$(DiaMetadataVersion)" PrivateAssets="none" /> -->
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
     <PackageReference Include="System.Collections.Immutable" Version="5.0.0" />