In my experience, Auto update did not upgrade to Debian 12. I had to update manually, from the command line. If you are on 23.6.2, you have the latest version of the FreedomBox package (at least from the stable repos).
This is mine:
How’s yours? If you’re still on Debian 11, you might need to perform the distribution upgrade manually.
Read these topics for more info:
https://discuss.freedombox.org/t/debian-12-bookworm-release-and-upgrading/2591
https://discuss.freedombox.org/t/update-when-to-panic/2608
https://discuss.freedombox.org/t/what-do-we-do-after-another-unsuccessful-update/2611