Upgrade to Scala 2.13.6, Scala.js 1.5.1, sbt 1.5.2#12501

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dotty-staging:upgrade-scala-2.13.6

May 18, 2021

Commits on May 17, 2021

Upgrade to Scala 2.13.6, Scala.js 1.5.1, sbt 1.5.2
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