Update sbt-example to 9.3.1

Author: scala-steward

project/plugins.sbt

@@ -14,6 +14,6 @@ addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.2.1")
 
 addSbtPlugin("org.lyranthe.sbt" % "partial-unification" % "1.1.2")
 
-addSbtPlugin("com.thoughtworks.example" % "sbt-example" % "9.2.1")
+addSbtPlugin("com.thoughtworks.example" % "sbt-example" % "9.3.1")
 
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.2.0")