Merge pull request #2899 from scala-steward/update/series/2.x/sbt-scalajs-crossproject-1.2.0

Update sbt-scalajs-crossproject to 1.2.0 in series/2.x

Author: djspiewak

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.7.1")
-addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.1.0")
+addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.2.0")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.3")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.6")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.2.24")