Where did the classes InternalUtils and ItemUtils go in AWS SDK 2.x?

Question

The answers to the question Converting DynamoDB JSON to Standard JSON with Java are obsolete in 2022.

The problem is that both of these imports no longer work:

import com.amazonaws.services.dynamodbv2.document.internal.InternalUtils;

import com.amazonaws.services.dynamodbv2.document.ItemUtils;

What happens: the import fails.

You can also verify it in the documentation, here: https://sdk.amazonaws.com/java/api/latest/index.html?software/amazon/awssdk/services/dynamodb/package-summary.html

The question is, what classes replace these two classes in SDK 2.x?