Replace deprecated PropertyNamingStrategy with PropertyNamingStrategies

Co-authored-by: Mat001 <1386553+Mat001@users.noreply.github.com>

Author: Copilot

core-api/src/main/java/com/optimizely/ab/event/internal/serializer/JacksonSerializer.java

@@ -1,6 +1,6 @@
 /**
  *
- *    Copyright 2016-2017, 2019, Optimizely and contributors
+ *    Copyright 2016-2017, 2019, 2025, Optimizely and contributors
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -19,13 +19,13 @@
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.databind.PropertyNamingStrategy;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
 
 class JacksonSerializer implements Serializer {
 
     private ObjectMapper mapper =
         new ObjectMapper().setPropertyNamingStrategy(
-            PropertyNamingStrategy.SNAKE_CASE);
+            PropertyNamingStrategies.SNAKE_CASE);
 
     public <T> String serialize(T payload) {
         mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

core-api/src/test/java/com/optimizely/ab/event/internal/serializer/JacksonSerializerTest.java

@@ -1,6 +1,6 @@
 /**
  *
- *    Copyright 2016-2017, 2019, Optimizely and contributors
+ *    Copyright 2016-2017, 2019, 2025, Optimizely and contributors
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -18,7 +18,7 @@
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 
-import com.fasterxml.jackson.databind.PropertyNamingStrategy;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
 import com.optimizely.ab.event.internal.payload.EventBatch;
 
 import org.junit.Test;
@@ -42,7 +42,7 @@ public class JacksonSerializerTest {
     private JacksonSerializer serializer = new JacksonSerializer();
     private ObjectMapper mapper =
         new ObjectMapper().setPropertyNamingStrategy(
-            PropertyNamingStrategy.SNAKE_CASE);
+            PropertyNamingStrategies.SNAKE_CASE);
 
 
     @Test