revert kryo major upgrade

Author: Brendan Doyle

core/scheduler/build.gradle

@@ -69,7 +69,7 @@ dependencies {
     }
     implementation "org.scala-lang:scala-library:${gradle.scala.version}"
     implementation project(':common:scala')
-    implementation "io.altoo:akka-kryo-serialization_${gradle.scala.depVersion}:2.5.0"
+    implementation "io.altoo:akka-kryo-serialization_${gradle.scala.depVersion}:1.0.0"
     implementation "com.lightbend.akka.management:akka-management-cluster-bootstrap_${gradle.scala.depVersion}:${gradle.akka_management.version}"
     implementation "com.lightbend.akka.discovery:akka-discovery-kubernetes-api_${gradle.scala.depVersion}:${gradle.akka_management.version}"
 }

core/scheduler/src/main/scala/org/apache/openwhisk/core/scheduler/Scheduler.scala

@@ -18,7 +18,7 @@
 package org.apache.openwhisk.core.scheduler
 
 import akka.Done
-import akka.actor.{ActorRef, ActorRefFactory, ActorSelection, ActorSystem, CoordinatedShutdown, ExtendedActorSystem, Props}
+import akka.actor.{ActorRef, ActorRefFactory, ActorSelection, ActorSystem, CoordinatedShutdown, Props}
 import akka.http.scaladsl.Http
 import akka.http.scaladsl.model.{HttpRequest, HttpResponse}
 import akka.management.scaladsl.AkkaManagement
@@ -429,7 +429,7 @@ case class SchedulingConfig(staleThreshold: FiniteDuration,
                             namespaceOverProvisionBeforeThrottleRatio: Double)
 
 class CompatibleKryoInitializer extends DefaultKryoInitializer {
-  override def preInit(kryo: ScalaKryo, system: ExtendedActorSystem): Unit = {
+  override def preInit(kryo: ScalaKryo): Unit = {
     kryo.setDefaultSerializer(classOf[com.esotericsoftware.kryo.serializers.CompatibleFieldSerializer[_]])
   }
 }