Bump NuGet.Protocol from 6.2.2 to 6.2.4 in /ICSharpCode.Decompiler.Tests

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client) from 6.2.2 to 6.2.4.
- [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
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
@@ -45,7 +45,7 @@
   <ItemGroup>
     <PackageReference Include="DiffLib" Version="$(DiffLibVersion)" />
     <PackageReference Include="CliWrap" Version="3.4.4" />
-    <PackageReference Include="NuGet.Protocol" Version="6.2.2" />
+    <PackageReference Include="NuGet.Protocol" Version="6.2.4" />
     <PackageReference Include="System.Collections.Immutable" Version="$(SystemCollectionsImmutableVersion)" />
     <PackageReference Include="System.Reflection.Metadata" Version="$(SystemReflectionMetadataVersion)" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="$(RoslynVersion)" />