Remove all additional resolvers from build.sbt, at least for releases, because artifacts published to Maven central repository should not contain additional repositories, and in fact don't need them because all dependencies are already in Maven central repo.

Scalafix commits are currently attributed in the Git history to the Scala Steward user although it only did the easy part of running the rule. The hard part of writing the rule is done by someone else who's currently not attributed in any way. Wouldn't it be nice if we append Co-authored-by attributions to the Scalafix commit if the rule author(s) opts into i