Remove Authorization dependency on Core (#750)

Author: Shane32

src/Authorization.AspNetCore/Authorization.AspNetCore.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
-    <ProjectReference Include="..\Core\Core.csproj" />
+    <PackageReference Include="GraphQL" Version="5.0.0-preview-476" />
   </ItemGroup>
 
 </Project>