Thanks, @thread, I believe I just discussed this with a teammate of yours on our chat.
In summary, the dependency that is failing to download for you guys is hosted on JitPack which service was having an intermittent outage for over a week. Unfortunately, this information isn’t displayed or noted by them anywhere, so it’s understandably confusing.
So this is a duplicate of this thread: Build fails (ArtifactResolveException)
And here you can find a thread with more info and possible workaround: https://github.com/jitpack/jitpack.io/issues/3973