YARN-10337. Amendment to fix import as in HADOOP-17100

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRMHATimelineCollectors.java

@@ -28,7 +28,7 @@ import org.apache.hadoop.yarn.server.timelineservice.storage.TimelineWriter;
 import org.junit.Before;
 import org.junit.Test;
 
-import com.google.common.base.Supplier;
+import java.util.function.Supplier;
 
 import java.util.ArrayList;
 import java.util.List;