Converting nuget or msbuild for that matter, find the equivalent in dotnet. For converting your nuget sources update you have to change almost all words. Here an example:
//nuget sources <operation> -Name <name> -Source <source>
nuget sources update -name "my-package" -Username name -Password ${{ secrets.mysecret }}// dotnet nuget update source <NAME>
dotnet nuget update source my-package --username name --password ${{ secrets.mysecret }}You add dotnet at the start. Remember to change sources to source without the s. Update and source has moved places. All argument will be changed from one dash – to double dashes –. And argument names are all lowercases.
Nuget source: https://docs.microsoft.com/en-us/nuget/reference/cli-reference/cli-ref-sources
Dotnet Source: https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-nuget-update-source