BAEL-5214: Upgrade xstream and jettison versions (#11332)

xstream/src/main/java/com/baeldung/initializer/SimpleXstreamInitializer.java

@@ -7,7 +7,11 @@ import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
 public class SimpleXstreamInitializer {
 
     public XStream getXstreamInstance() {
-        return new XStream();
+        XStream xstream = new XStream();
+        xstream.allowTypesByWildcard(new String[]{
+                "com.baeldung.**"
+        });
+        return xstream;
     }
 
     public XStream getXstreamJettisonMappedInstance() {

xstream/src/test/java/com/baeldung/rce/XStreamBasicsUnitTest.java

@@ -21,6 +21,7 @@ public final class XStreamBasicsUnitTest {
     public void before() {
         xstream = new XStream();
         xstream.alias("person", Person.class);
+        xstream.allowTypes(new Class<?>[] { Person.class });
     }
 
     @Test