Fix maintainer comments

Author: RanVaknin

pom.xml

@@ -105,9 +105,9 @@
         <awsjavasdk.version>${project.version}</awsjavasdk.version>
         <awsjavasdk.previous.version>2.36.2</awsjavasdk.previous.version>
         <awsjavasdk.previous-previous.version>2.36.1</awsjavasdk.previous-previous.version>
-        <jackson.version>2.18.0</jackson.version>
-        <jackson.databind.version>2.18.0</jackson.databind.version>
-        <jacksonjr.version>2.18.0</jacksonjr.version>
+        <jackson.version>2.15.2</jackson.version>
+        <jackson.databind.version>2.15.2</jackson.databind.version>
+        <jacksonjr.version>2.17.3</jacksonjr.version>
         <eventstream.version>1.0.1</eventstream.version>
         <commons.lang.version>3.14.0</commons.lang.version>
         <wiremock.version>2.32.0</wiremock.version>

services-custom/dynamodb-enhanced/src/main/java/software/amazon/awssdk/enhanced/dynamodb/internal/document/DocumentJsonSerializer.java

@@ -30,8 +30,8 @@
  * JSON serializer for DynamoDB Enhanced Client document operations.
  */
 @SdkInternalApi
-public final class DocumentJsonSerializer {
-    private static final JsonFactory JSON_FACTORY = new JsonFactory()   {
+final class DocumentJsonSerializer {
+    private static final JsonFactory JSON_FACTORY = new JsonFactory() {
         @Override
         public JsonGenerator createGenerator(OutputStream out) throws IOException {
             return super.createGenerator(out).enable(JsonGenerator.Feature.COMBINE_UNICODE_SURROGATES_IN_UTF8);