Update sbt-native-packager to 1.9.9 (#107)

Author: scala-steward

project/plugins.sbt

@@ -1,3 +1,3 @@
-addSbtPlugin("com.github.sbt" % "sbt-native-packager" % "1.9.7")
+addSbtPlugin("com.github.sbt" % "sbt-native-packager" % "1.9.9")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.10.0")
 addSbtPlugin("com.typesafe.sbt" % "sbt-git" % "1.0.2")