remove ability to pass a null java timeout

http-core/src/main/scala/org/apache/pekko/http/impl/engine/server/HttpServerBluePrint.scala

@@ -414,17 +414,13 @@
     import pekko.http.impl.util.JavaMapping.Implicits._
 
     /** JAVA API * */
-    override def updateTimeout(timeout: java.time.Duration): Unit = {
-      val stimeout = if (timeout eq null) null else timeout.asScala
-      update(stimeout, null: HttpRequest => HttpResponse)
-    }
+    override def updateTimeout(timeout: java.time.Duration): Unit =
+      update(timeout.asScala, null: HttpRequest => HttpResponse)
     override def update(timeout: Duration, handler: Function[model.HttpRequest, model.HttpResponse]): Unit =
       update(timeout, handler(_: HttpRequest).asScala)
     override def update(
-        timeout: java.time.Duration, handler: Function[model.HttpRequest, model.HttpResponse]): Unit = {
-      val stimeout = if (timeout eq null) null else timeout.asScala
-      update(stimeout, handler(_: HttpRequest).asScala)
-    }
+        timeout: java.time.Duration, handler: Function[model.HttpRequest, model.HttpResponse]): Unit =
+      update(timeout.asScala, handler(_: HttpRequest).asScala)
     override def updateHandler(handler: Function[model.HttpRequest, model.HttpResponse]): Unit =
       updateHandler(handler(_: HttpRequest).asScala)
 
@@ -733,7 +729,7 @@
         })
 
       private var activeTimers = 0
       private def timeout = materializer.settings.subscriptionTimeoutSettings.timeout
       private def addTimeout(s: SubscriptionTimeout): Unit = {
         if (activeTimers == 0) setKeepGoing(true)
         activeTimers += 1