Java 11 migrate remaining e (#1112)

* Moves eip-aggregator to Java 11

* Moves eip-message-channel to Java 11

* Moves eip-publish-subscribe to Java 11

* Moves eip-splitter to Java 11

* Moves eip-wire-tap to Java 11

* Moves event-aggregator to Java 11

* Moves event-asynchronous to Java 11

* Moves event-driven-architecture to Java 11

* Moves event-queue to Java 11

* Moves event-sourcing to Java 11

* Moves execute-around to Java 11

* Moves extension-objects to Java 11

extension-objects/src/test/java/concreteextensions/SergeantTest.java

@@ -31,9 +31,8 @@ import units.SergeantUnit;
  */
 public class SergeantTest {
   @Test
-  public void sergeantReady() throws Exception {
-    final Sergeant sergeant = new Sergeant(new SergeantUnit("SergeantUnitTest"));
-
+  public void sergeantReady() {
+    final var sergeant = new Sergeant(new SergeantUnit("SergeantUnitTest"));
     sergeant.sergeantReady();
   }