Fix import after rebase

Author: dadoonet

core/src/main/java/org/testcontainers/containers/GenericContainer.java

@@ -59,6 +59,7 @@
 import org.testcontainers.utility.PathUtils;
 import org.testcontainers.utility.ResourceReaper;
 import org.testcontainers.utility.TestcontainersConfiguration;
+import org.testcontainers.utility.ducttape.Timeouts;
 import org.testcontainers.utility.ducttape.Unreliables;
 
 import java.io.File;