Update junit-plugin, junit-runtime, ... to 0.4.9 (#574)

Author: scala-steward

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("org.scala-js"           % "sbt-scalajs"                   % "1.11.0")
 addSbtPlugin("org.portable-scala"     % "sbt-scalajs-crossproject"      % "1.2.0")
-addSbtPlugin("org.scala-native"       % "sbt-scala-native"              % "0.4.7")
+addSbtPlugin("org.scala-native"       % "sbt-scala-native"              % "0.4.9")
 addSbtPlugin("org.portable-scala"     % "sbt-scala-native-crossproject" % "1.2.0")
 addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module"              % "3.0.1")
 addSbtPlugin("ch.epfl.scala"          % "sbt-scalafix"                  % "0.10.4")