make pekko test code more scala 3 friendly

Author: pjfanning

instrumentation/pekko/pekko-http-1.0/javaagent/src/test/scala/io/opentelemetry/javaagent/instrumentation/pekkohttp/v1_0/PekkoHttpClientInstrumentationTest.scala

@@ -43,8 +43,7 @@ class PekkoHttpClientInstrumentationTest
     HttpClientInstrumentationExtension.forAgent()
 
   val system: ActorSystem = ActorSystem.create()
-  implicit val materializer: ActorMaterializer =
-    ActorMaterializer.create(system)
+  val materializer: ActorMaterializer = ActorMaterializer.create(system)
 
   override def buildRequest(
       method: String,

instrumentation/pekko/pekko-http-1.0/javaagent/src/test/scala/io/opentelemetry/javaagent/instrumentation/pekkohttp/v1_0/PekkoHttpTestServerSourceWebServer.scala

@@ -16,13 +16,13 @@ import org.apache.pekko.http.scaladsl.server.Directives._
 import org.apache.pekko.stream.ActorMaterializer
 import org.apache.pekko.stream.scaladsl.Sink
 
-import scala.concurrent.Await
+import scala.concurrent.{Await, ExecutionContext}
 
 object PekkoHttpTestServerSourceWebServer {
-  implicit val system = ActorSystem("my-system")
-  implicit val materializer = ActorMaterializer()
+  implicit val system: ActorSystem = ActorSystem("my-system")
+  implicit val materializer: ActorMaterializer = ActorMaterializer()
   // needed for the future flatMap/onComplete in the end
-  implicit val executionContext = system.dispatcher
+  implicit val executionContext: ExecutionContext = system.dispatcher
 
   var route = get {
     concat(

instrumentation/pekko/pekko-http-1.0/javaagent/src/test/scala/io/opentelemetry/javaagent/instrumentation/pekkohttp/v1_0/PekkoHttpTestSyncWebServer.scala

@@ -18,13 +18,13 @@ import io.opentelemetry.instrumentation.testing.junit.http.{
 import io.opentelemetry.instrumentation.testing.junit.http.ServerEndpoint._
 
 import java.util.function.Supplier
-import scala.concurrent.Await
+import scala.concurrent.{Await, ExecutionContext}
 
 object PekkoHttpTestSyncWebServer {
-  implicit val system = ActorSystem("my-system")
+  implicit val system: ActorSystem = ActorSystem("my-system")
   implicit val materializer = ActorMaterializer()
   // needed for the future flatMap/onComplete in the end
-  implicit val executionContext = system.dispatcher
+  implicit val executionContext: ExecutionContext = system.dispatcher
   val syncHandler: HttpRequest => HttpResponse = {
     case HttpRequest(GET, uri: Uri, _, _, _) => {
       val endpoint = ServerEndpoint.forPath(uri.path.toString())

instrumentation/pekko/pekko-http-1.0/javaagent/src/test/scala/io/opentelemetry/javaagent/instrumentation/pekkohttp/v1_0/PekkoHttpTestWebServer.scala

@@ -15,13 +15,13 @@ import org.apache.pekko.http.scaladsl.model.StatusCodes.Found
 import org.apache.pekko.http.scaladsl.server.Directives._
 import org.apache.pekko.stream.ActorMaterializer
 
-import scala.concurrent.Await
+import scala.concurrent.{Await, ExecutionContext}
 
 object PekkoHttpTestWebServer {
-  implicit val system = ActorSystem("my-system")
+  implicit val system: ActorSystem = ActorSystem("my-system")
   implicit val materializer = ActorMaterializer()
   // needed for the future flatMap/onComplete in the end
-  implicit val executionContext = system.dispatcher
+  implicit val executionContext: ExecutionContext = system.dispatcher
 
   var route = get {
     concat(