Update NuGe.Protocol to latest stable 5.6.0 (#196)

Author: satbai

Build.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <CredentialProviderVersion>0.1.23</CredentialProviderVersion>
+    <CredentialProviderVersion>0.1.24</CredentialProviderVersion>
   </PropertyGroup>
 </Project>

CredentialProvider.Microsoft.Tests/CredentialProvider.Microsoft.Tests.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="Moq" Version="4.13.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.0.0" />
     <PackageReference Include="MSTest.TestFramework" Version="2.0.0" />
-    <PackageReference Include="NuGet.Protocol" Version="5.3.0" />
+    <PackageReference Include="NuGet.Protocol" Version="5.6.0" />
   </ItemGroup>
 
   <ItemGroup>

CredentialProvider.Microsoft/CredentialProvider.Microsoft.csproj

@@ -33,7 +33,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.IdentityModel.Clients.ActiveDirectory" Version="5.2.3" />
-    <PackageReference Include="NuGet.Protocol" Version="5.3.0" />
+    <PackageReference Include="NuGet.Protocol" Version="5.6.0" />
     <PackageReference Include="PowerArgs" Version="3.6.0" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19554-01" PrivateAssets="All"/>
   </ItemGroup>