Update Task to resolve Micromenter 2.0.x upgrade issue.

This will resolve the current issue, but improvements to Task's use of Micrometer 2.0 are coming in a upcoming PR

spring-cloud-task-core/src/main/java/org/springframework/cloud/task/listener/TaskMetrics.java

@@ -116,7 +116,7 @@ public class TaskMetrics {
 							(this.exception == null) ? "none"
 									: this.exception.getClass().getSimpleName())
 					.tag(TASK_STATUS_TAG,
-							(this.exception == null) ? STATUS_SUCCESS : STATUS_FAILURE));
+							(this.exception == null) ? STATUS_SUCCESS : STATUS_FAILURE).register(Metrics.globalRegistry));
 			this.taskSample = null;
 		}