Remove deprecation notice.

The chunks() method no longer exists. So this method is not deprecated.

src/Collection/CollectionInterface.php

@@ -975,7 +975,6 @@ interface CollectionInterface extends Iterator, JsonSerializable
      *
      * @param int $chunkSize The maximum size for each chunk
      * @return \Cake\Collection\CollectionInterface
-     * @deprecated 4.0.0 Deprecated in favor of chunks
      */
     public function chunk($chunkSize);