removed extra line

Author: bachuv

client/src/main/java/com/microsoft/durabletask/DurableTaskGrpcClient.java

@@ -14,7 +14,6 @@
 import java.time.Duration;
 import java.time.Instant;
 import java.util.*;
-
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.logging.Logger;