Update MGCB editor references for updated CP by SimonDarksideJ · Pull Request #8979

Update MGCB editor references for updated CP by SimonDarksideJ · Pull Request #8979 · MonoGame/MonoGame

Summary

New references were added to the Content Pipeline in recent updates for Content Builder support, however these are also required in the editors which also consume the pipeline, namely:

System.CommandLine
YamlDotNet

This PR adds the missing references enabling the MGCB editor(s) to be able to resolve dependencies for the .mgcb content files