NuGet.Config is no longer present - therefore, explicitly state where to get this script's dependencies.

Author: John Beisner

build_projects/update-dependencies/update-dependencies.csproj

@@ -5,6 +5,7 @@
     <Description>Updates the repos dependencies</Description>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.1</TargetFramework>
+    <RestoreSources>https://dotnetfeed.blob.core.windows.net/dotnet-core/index.json;https://api.nuget.org/v3/index.json</RestoreSources>
   </PropertyGroup>
 
   <ItemGroup>