Use different feed for dotnet/runtime/release/6.0

Context: #7355

Author: jonathanpeppers

NuGet.config

@@ -11,7 +11,7 @@
     <add key="xamarin.android util" value="https://pkgs.dev.azure.com/xamarin/public/_packaging/Xamarin.Android/nuget/v3/index.json" />
     <!-- Added manually for dotnet/runtime 6.0.9 -->
     <add key="darc-pub-dotnet-emsdk-3f6c45a" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-emsdk-3f6c45a2/nuget/v3/index.json" />
-    <add key="darc-pub-dotnet-runtime-531f715" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-runtime-531f715f/nuget/v3/index.json" />
+    <add key="darc-pub-dotnet-runtime-f2112e3" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-runtime-f2112e3d/nuget/v3/index.json" />
   </packageSources>
   <disabledPackageSources />
 </configuration>