Switch away from deprecated method

[duglin]

See:

sdk-java/formats/json-jackson/src/main/java/io/cloudevents/jackson/CloudEventDeserializer.java

Line 121 in b9eaa2f

data = new JsonCloudEventData(node.remove("data"));

it appears to use JsonCloudEventData which is tagged as deprecated:

    /**
     * @param node the json node to wrap
     * @deprecated You should use {@link #wrap(JsonNode)}
     */
    public JsonCloudEventData(JsonNode node) {
        Objects.requireNonNull(node);
        this.node = node;
    }

[duglin]

thanks @pierDipi