Bump NuGet.Protocol from 6.2.1 to 6.2.2 in /ICSharpCode.Decompiler.Tests (#2804)

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client) from 6.2.1 to 6.2.2.
- [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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ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -45,7 +45,7 @@
   <ItemGroup>
     <PackageReference Include="DiffLib" Version="$(DiffLibVersion)" />
     <PackageReference Include="CliWrap" Version="3.4.4" />
-    <PackageReference Include="NuGet.Protocol" Version="6.2.1" />
+    <PackageReference Include="NuGet.Protocol" Version="6.2.2" />
     <PackageReference Include="System.Collections.Immutable" Version="$(SystemCollectionsImmutableVersion)" />
     <PackageReference Include="System.Reflection.Metadata" Version="$(SystemReflectionMetadataVersion)" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="$(RoslynVersion)" />