[tlu] another notarized beta

[Adam R. Maxwell]

If anyone could give this a try, I'd appreciate it: just let me know if it launches or not.

https://github.com/amaxwell/tlutility/releases/download/1.42b19/TeX.Live.Utility.app-1.42b19.dmg

There have been no code changes since the previous beta, but there has been a pretty complicated rewrite of my code signing and build scripts. If this works, I'll make an official release.

thanks,
Adam