Update sbt-native-packager to 1.9.6 (#340)

Author: scala-steward

project/plugins.sbt

@@ -7,7 +7,7 @@ addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.6.1")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.0.1")
 addSbtPlugin("com.typesafe.sbt" % "sbt-ghpages" % "0.6.3")
 addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "1.0.2")
-addSbtPlugin("com.github.sbt" % "sbt-native-packager" % "1.9.0")
+addSbtPlugin("com.github.sbt" % "sbt-native-packager" % "1.9.6")
 addSbtPlugin("com.typesafe.sbt" % "sbt-site" % "1.4.1")
 addSbtPlugin("dev.travisbrown" % "sbt-javacc" % "0.1.0")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.4.3")