Update sbt-scala-native to 0.5.6 (#371)

Author: softwaremill-ci

project/plugins.sbt

@@ -1,6 +1,6 @@
 libraryDependencies += "org.scala-js" %% "scalajs-env-selenium" % "1.1.1"
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.17.0")
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.5")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.6")
 addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.10.0")
 
 val sbtSoftwareMillVersion = "2.0.21"