Merge commit '603a70296d' into merge-2.12-into-2.13.x

* commit '603a70296d':
  fix our Windows Jenkins job (sbt 1.3 upgrade broke it)
  [nomerge] Update to sbt 1.3.8, remove workarounds
  Clear my terminal of a pair of unused-import warnings
  [nomerge] HashMap#transform reuses structure

Author: dwijnand