fix spec

Author: Jaap van der Plas

src/it/scala/io/iohk/ethereum/sync/FastSyncItSpec.scala

@@ -229,7 +229,7 @@ class FastSyncItSpec extends FlatSpecBase with Matchers with BeforeAndAfterAll {
       _ <- peer4.importBlocksUntil(1100)(IdentityUpdate)
 
       _ <- peer1.connectToPeers(Set(peer2.node, peer3.node, peer4.node))
-      _ <- peer1.startFastSync().delayExecution(50.milliseconds)
+      _ <- peer1.startFastSync().delayExecution(500.milliseconds)
       _ <- peer2.importBlocksUntil(1200)(IdentityUpdate)
       _ <- peer1.waitForFastSyncFinish()
     } yield {