Fix CI URL from organization change

Author: michael-hawker

samples/NuGet.config

@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
-    <packageSources>
-        <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
-        <add key="WindowsCommunityToolkit-CI" value="https://pkgs.dev.azure.com/dotnet/WindowsCommunityToolkit/_packaging/WindowsCommunityToolkit-MainLatest/nuget/v3/index.json" />
-    </packageSources>
-</configuration>
+  <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+    <add key="CommunityToolkit-CI" value="https://pkgs.dev.azure.com/dotnet/CommunityToolkit/_packaging/CommunityToolkit-MainLatest/nuget/v3/index.json" />
+  </packageSources>
+  <disabledPackageSources>
+    <clear />
+  </disabledPackageSources>
+</configuration>