Update nscplugin, sbt-scala-native to 0.5.6

Author: typelevel-steward[bot]

project/plugins.sbt

@@ -11,6 +11,6 @@ addSbtPlugin("com.github.sbt" % "sbt-site-paradox" % "1.7.0")
 addSbtPlugin("com.github.sbt" % "sbt-ghpages" % "0.8.0")
 addSbtPlugin("com.timushev.sbt" % "sbt-updates" % "0.6.4")
 addSbtPlugin("org.scala-js" % "sbt-scalajs" % "1.18.2")
-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")
 addSbtPlugin("org.scalameta" % "sbt-mdoc" % "2.6.2")