[java] Removing unused import

[skip ci]

Author: diemol

java/src/org/openqa/selenium/remote/http/RetryRequest.java

@@ -28,7 +28,6 @@
 import org.openqa.selenium.TimeoutException;
 
 import java.net.ConnectException;
-import java.time.Duration;
 import java.time.temporal.ChronoUnit;
 import java.util.logging.Logger;