Update nscplugin, sbt-scala-native to 0.5.6

Author: typelevel-steward[bot]

project/plugins.sbt

@@ -1,6 +1,6 @@
 addSbtPlugin("pl.project13.scala" % "sbt-jmh"                       % "0.4.7")
 addSbtPlugin("org.scala-js"       % "sbt-scalajs"                   % "1.16.0")
-addSbtPlugin("org.scala-native"   % "sbt-scala-native"              % "0.4.17")
+addSbtPlugin("org.scala-native"   % "sbt-scala-native"              % "0.5.6")
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.2")
 val sbtTypelevelVersion = "0.7.4"
 addSbtPlugin("org.typelevel" % "sbt-typelevel"      % sbtTypelevelVersion)