MINOR: Remove duplicated code in PgeViewDemo (#20252)

Remove the default implementation

Reviewers: Lucas Brutschy <lucasbru@apache.org>

Author: RaidenE1

streams/examples/src/main/java/org/apache/kafka/streams/examples/pageview/PageViewUntypedDemo.java

@@ -40,7 +40,6 @@
 
 import java.io.IOException;
 import java.time.Duration;
-import java.util.Map;
 import java.util.Properties;
 
 /**
@@ -64,11 +63,6 @@ public class PageViewUntypedDemo {
     public static class JsonNodeSerializer implements Serializer<JsonNode> {
         private final ObjectMapper objectMapper = new ObjectMapper();
 
-        @Override
-        public void configure(final Map<String, ?> configs, final boolean isKey) {
-            // No configuration needed
-        }
-
         @Override
         public byte[] serialize(final String topic, final JsonNode data) {
             if (data == null) {
@@ -80,11 +74,6 @@ public byte[] serialize(final String topic, final JsonNode data) {
                 throw new SerializationException("Error serializing JSON message", e);
             }
         }
-
-        @Override
-        public void close() {
-            // No resources to close
-        }
     }
 
     /**
@@ -93,11 +82,6 @@ public void close() {
     public static class JsonNodeDeserializer implements Deserializer<JsonNode> {
         private final ObjectMapper objectMapper = new ObjectMapper();
 
-        @Override
-        public void configure(final Map<String, ?> configs, final boolean isKey) {
-            // No configuration needed
-        }
-
         @Override
         public JsonNode deserialize(final String topic, final byte[] data) {
             if (data == null) {
@@ -109,11 +93,6 @@ public JsonNode deserialize(final String topic, final byte[] data) {
                 throw new SerializationException("Error deserializing JSON message", e);
             }
         }
-
-        @Override
-        public void close() {
-            // No resources to close
-        }
     }
 
     public static void main(final String[] args) throws Exception {