Update sbt-example to 9.2.1 (#641)

Author: scala-steward

project/plugins.sbt

@@ -8,7 +8,7 @@ addSbtPlugin("com.dwijnand" % "sbt-dynver" % "4.1.1")
 
 addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.2.1")
 
-addSbtPlugin("com.thoughtworks.example" % "sbt-example" % "9.2.0")
+addSbtPlugin("com.thoughtworks.example" % "sbt-example" % "9.2.1")
 
 addSbtPlugin("org.portable-scala" % "sbt-scalajs-crossproject" % "1.2.0")