v1.2.4 - Fix --replace functionality

discord-microhook was updated to v1.0.5 which adds artificial thread support. In doing so, the channel ID for the message is no longer sent to the request (which was causing the error to begin with). Furthermore, the literal of null appearing in the cache has been fixed, and will now either be {webhookID} or {webhookID}-{threadID} to ensure cache accessibility (and backport consistency with prior stable versions).

v1.2.3 was published, but did not fix any problems due to persistent issues with discord-microhook until now. So it will be left unpublished on here.

CRLF line break CI errors are still appearing in the actions log, I'll see if I can disable or correct it for next minor or major release.