Even if this sort of (obviously rare) attack is not a concern, it baffles me how few otherwise-intelligent people fail to see the way these updaters provide the network (which itself is always listening, see Room 641A and friends) with a fingerprint of your specific computer and a way to track its physical location based on the set of software you have installed, all of which want to check for updates every goddamn day.
That would be two things that would have to be compromised and redirected simultaneously to malicious versions. Way more likely to be noticed too because one of them would be GitHub, and unless they mirror the entire rest of the package metadata index and keep it up to date for everything else besides their targeted malicious package.