In a previous diff I removed `jcenter()` and replaced it with `gradlePluginPortal()` since `jcenter()` is (one day) going to be taken down and has experienced issues in the past.
However... we're now experiencing issues with the Gradle Plugin Portal: https://status.gradle.com/incidents/9j9bx7nlwwf1
I wonder if adding `jcenter()` as a fallback will resolve things (at least in the short tun)
NOTE: I plan on reverting this in a few days once whatever intermittent Gradle issue is over.