Update sbt-scalajs, scalajs-compiler, ... to 1.19.0 (#295)

Author: scala-steward

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.3.2")
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.18.2")
+addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.19.0")
 
 addSbtPlugin("io.github.davidgregory084" % "sbt-tpolecat" % "0.4.1")