Enabled CheckpointsSpec.scala under Scala 3 build
Enabled CheckpointsSpec.scala under Scala 3 build

cheeseng/scalatest,dotty-staging/scalatest,scalatest/scalatest,scalatest/scalatest,cheeseng/scalatest,dotty-staging/scalatest,scalatest/scalatest,cheeseng/scalatest,dotty-staging/scalatest