Another part of electron-builder was rewritten in Go — as result, to get publisher name from code signing certificate, openssl is not required anymore on macOS/Linux and bloody PowerShell on Windows.
If you use electron-updater, strongly recommended to update electron-builder to 20.33.1 and electron-updater to 3.2.1. These versions are next (pre-release) for now, but will be promoted as latest in several days.