The embedded plugin registry's build is failing because the latest version of muhammad-sammy.csharp extension depends on ms-dotnettools.vscode-dotnet-runtime which is not in the list of embedded extensions:
191.9 Downloading https://open-vsx.org/api/muhammad-sammy/csharp/2.0.436/file/muhammad-sammy.csharp-2.0.436.vsix into muhammad-sammy folder... 195.0 🚀 Created namespace muhammad-sammy 195.5 ❌ Cannot resolve dependency: ms-dotnettools.vscode-dotnet-runtime 195.5 See the documentation for more information: 195.5 https://github.com/eclipse/openvsx/wiki/Publishing-Extensions