My sources.list file:
Ok, you are trying to upgrade from 5 to 6, correct?
[EDIT]
And you are using a PiOS that is running on armhf?
A word of advice: start fresh with a clean SDcard but use the latest Bookworm arm64 lite OS to install OMV7 with the script.
Armhf is deprecated and most docker container's won't run on it.
Was asleep and just skimmed through the outputs,
[/EDIT]
Just make screenshots of the OMV5 settings you have, keep them safe and then use them as guidelines to set OMV7 as you have/need.
If you want to keep going as you are, before running the omv-release-upgrade, you need to sort the lists.
Make sure you disable backports and clean the repos on the omv-extras GUI.
After, check and post the outputs of:
sudo cat /etc/apt/sources.list
sudo ls -al /etc/apt/sources.list.d/
sudo cat /etc/apt/sources.list.d/*.list