Fix raw usage of generic class

Author: adutra

core/src/test/java/com/datastax/oss/driver/internal/core/util/concurrent/ScheduledTaskCapturingEventLoop.java

@@ -47,7 +47,7 @@
 @SuppressWarnings("FunctionalInterfaceClash") // does not matter for test code
 public class ScheduledTaskCapturingEventLoop extends DefaultEventLoop {
 
-  private final BlockingQueue<CapturedTask> capturedTasks = new ArrayBlockingQueue<>(100);
+  private final BlockingQueue<CapturedTask<?>> capturedTasks = new ArrayBlockingQueue<>(100);
 
   public ScheduledTaskCapturingEventLoop(EventLoopGroup parent) {
     super(parent);