Update Owin.Security.OAuth.Introspection and Owin.Security.OAuth.Validation to target Katana 4.0.0-alpha1

Author: kevinchalet

NuGet.config

@@ -2,8 +2,6 @@
 <configuration>
   <packageSources>
     <add key="NuGet" value="https://api.nuget.org/v3/index.json" />
-    <add key="aspnetkatana" value="https://dotnet.myget.org/F/katana-dev/api/v3/index.json" />
     <add key="aspnet-contrib" value="https://www.myget.org/F/aspnet-contrib/api/v3/index.json" />
-    <add key="azureadwebstacknightly" value="https://www.myget.org/F/azureadwebstacknightly/api/v3/index.json" />
   </packageSources>
 </configuration>

build/dependencies.props

@@ -3,14 +3,15 @@
   <PropertyGroup>
     <AspNetCoreVersion>2.0.0</AspNetCoreVersion>
     <CoreFxVersion>4.4.0</CoreFxVersion>
+    <IdentityModelVersion>5.2.0-preview1-408290725</IdentityModelVersion>
     <IdentityModelCoreVersion>2.1.4</IdentityModelCoreVersion>
     <JetBrainsVersion>10.3.0</JetBrainsVersion>
     <JsonNetVersion>10.0.2</JsonNetVersion>
     <MoqVersion>4.7.63</MoqVersion>
     <NetHttpVersion>4.3.2</NetHttpVersion>
     <NetStandardImplicitPackageVersion>2.0.0</NetStandardImplicitPackageVersion>
     <NetStandardLibraryNetFrameworkVersion>2.0.0</NetStandardLibraryNetFrameworkVersion>
-    <OwinVersion>3.0.1</OwinVersion>
+    <OwinVersion>4.0.0-alpha1</OwinVersion>
     <RuntimeFrameworkVersion>2.0.0</RuntimeFrameworkVersion>
     <TestSdkVersion>15.3.0</TestSdkVersion>
     <XunitVersion>2.3.0-*</XunitVersion>

src/Owin.Security.OAuth.Introspection/Owin.Security.OAuth.Introspection.csproj

@@ -16,7 +16,7 @@
     <PackageReference Include="JetBrains.Annotations" Version="$(JetBrainsVersion)" PrivateAssets="All" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="$(AspNetCoreVersion)" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="$(AspNetCoreVersion)" />
-    <PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="$(IdentityModelCoreVersion)" />
+    <PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="$(IdentityModelVersion)" />
     <PackageReference Include="Microsoft.Owin.Security.Interop" Version="$(AspNetCoreVersion)" />
     <PackageReference Include="Newtonsoft.Json" Version="$(JsonNetVersion)" />
     <PackageReference Include="System.Net.Http" Version="$(NetHttpVersion)" />