Merge pull request #841 from scala-steward/update/auxlib-0.5.6

Update auxlib, clib, javalib, nativelib, ... to 0.5.6

Author: SethTisue

project/plugins.sbt

@@ -16,4 +16,4 @@ addSbtPlugin("com.github.sbt" % "sbt-pgp"         % "2.3.0")
 addSbtPlugin("com.typesafe"   % "sbt-mima-plugin" % "1.1.4")
 
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.2")
-addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.5")
+addSbtPlugin("org.scala-native" % "sbt-scala-native" % "0.5.6")