Update sbt-scala-native-crossproject, ... to 1.3.1 (#543)

Author: scala-steward

project/plugins.sbt

@@ -1,8 +1,8 @@
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.13.1")
-addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.0")
+addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.1")
 
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.12")
-addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.0")
+addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.1")
 
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.11")