Remove lambdas from RestClientBase

Author: geoand

extensions/rest-client/runtime/src/main/java/io/quarkus/restclient/runtime/RestClientBase.java

@@ -9,7 +9,6 @@
 import java.security.cert.CertificateException;
 import java.util.Optional;
 import java.util.concurrent.TimeUnit;
-import java.util.stream.Stream;
 
 import javax.net.ssl.HostnameVerifier;