Update sbt-scalajs, scalajs-library_2.13, ... to 1.13.0

Author: scala-steward

project/plugins.sbt

@@ -1,5 +1,5 @@
 libraryDependencies += "org.scala-js" %% "scalajs-env-selenium" % "1.1.1"
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.12.0")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.13.0")
 addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.4.9")
 addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.9.0")