Fedora CoreOS rebasing to Fedora Linux 39

Fedora Linux 39 was released today [1]. The Fedora CoreOS testing stream has been rebased and is currently rolling out. In two weeks, it will be promoted to the stable stream.

For more information about Fedora 39, see the Fedora Project’s
list of official Changes [2] and the Fedora CoreOS analysis of each
Change [3].

As mentioned in a previous announcement, there are a few changes related to modularity, AWS AMIs, and moby-engine that require special attention. For more information, see [4].

Thank you to everyone helping find issues by running the next and
testing streams!