mockServer in WaitersUserAgentTest attached to dynamicPort to prevent failed to bind 8080 exceptions (#3338)

Author: joviegas

services/dynamodb/src/test/java/software/amazon/awssdk/services/dynamodb/WaitersUserAgentTest.java

@@ -48,7 +48,7 @@
 public class WaitersUserAgentTest {
 
     @Rule
-    public WireMockRule mockServer = new WireMockRule(options().notifier(new ConsoleNotifier(true)).dynamicHttpsPort());
+    public WireMockRule mockServer = new WireMockRule(options().notifier(new ConsoleNotifier(true)).dynamicHttpsPort().dynamicPort());
 
     private DynamoDbClient dynamoDbClient;
     private DynamoDbAsyncClient dynamoDbAsyncClient;