Update nuget.config

nuget.config

@@ -4,7 +4,7 @@
   <packageSources>
     <clear />
     <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="avalonia" value="https://pkgs.dev.azure.com/AvaloniaUI/AvaloniaUI/_packaging/avalonia-all/nuget/v3/index.json" protocolVersion="3" />
+    <add key="avalonia" value="https://nuget.avaloniaui.net/repository/avalonia-all/index.json" protocolVersion="3" />
     <add key="Nightly" value="https://pkgs.dev.azure.com/wieslawsoltes/GitHub/_packaging/Nightly/nuget/v3/index.json" protocolVersion="3" />
   </packageSources>
 </configuration>