hub-and-spoke change of 'origin' command argment type is not backward compatible

Hub-and-spoke altered the type of the command origin argument from string to int. This makes HA communications not backwardly compatible as older peers reject the new data type. This the response of a 2.4.0 peer to a heartbeat from its peer which is current master (2.5.8-dev):

2024-04-19 13:10:00.324 DEBUG [kea-dhcp6.http/1886.140305063425600] HTTP_SERVER_RESPONSE_SEND_DETAILS detailed information about response sent to 175.16.1.32:
HTTP/1.1 200 OK
Content-Length: 65
Content-Type: application/json
Date: Fri, 19 Apr 2024 13:10:00 GMT

[ { "result": 1, "text": "'origin' argument must be a string" } ]

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