update smithy4s

Author: kubukoz

project/plugins.sbt

@@ -14,6 +14,6 @@ addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")
 
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.4")
 
-addSbtPlugin("com.disneystreaming.smithy4s" % "smithy4s-sbt-codegen" % "0.18.37")
+addSbtPlugin("com.disneystreaming.smithy4s" % "smithy4s-sbt-codegen" % "0.18.38")
 
 addDependencyTreePlugin