Where are release notes for patch versions

Please could someone tell me where to get release notes for microk8s snap updates which are patch/bugfix versions.

On the Releases · canonical/microk8s · GitHub release notes page you only get information about the main releases, e.g. 1.27, 1.28

There are reasonably regular patches - e.g. 1.28.6 to 1.28.7 just out. Where are the release notes for these?