Remove procedure syntax (#25362)

project/MultiNode.scala

@@ -68,8 +68,8 @@ object MultiNode extends AutoPlugin {
           val logger = streams.value.log
           (name: String) =>
             new Logger {
-              def trace(t: => Throwable) { logger.trace(t) }
-              def success(message: => String) { success(message) }
+              def trace(t: => Throwable): Unit = { logger.trace(t) }
+              def success(message: => String): Unit = { success(message) }
               def log(level: Level.Value, message: => String): Unit =
                 logger.log(level, s"[${scala.Console.BLUE}$name${scala.Console.RESET}] $message")
             }