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REP-0003 describes ROS releases and for which Ubuntu distribution they are available. ROS releases will probably get updated at most as long as their Ubuntu distribution reaches end-of-life.
In practice, once released ROS versions will only get bug fixes, but there's no guaranteed date until that happens. I would say it strongly depends on the stack maintainer. Bugfixes for releases should at least be supplied as long as the current ROS release is the latest one.