Update nscplugin, sbt-scala-native, ... to 0.4.9 (#467)

Co-authored-by: typelevel-steward[bot] <106827141+typelevel-steward[bot]@users.noreply.github.com>

Author: typelevel-steward[bot]

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("org.portable-scala" % "sbt-scala-native-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.scala-js" % "sbt-scalajs" % "1.11.0")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.6")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.3")