Submit for review - AudioKit branch?

I have my first App ready and crash free (I think!) using AudioKit. While coding it I used the develop branch. I assume I should submit it with the main branch packages? Trouble is I updated my iPad to iOS15 (yesterday) so then had to move onto Xcode 13 and ended up have a lot of broken AudioKit code with the main branch of AudioKit. As well as a couple of issues with the develop branch - which I managed to fix.

This is my first App submission so I'd like to get it right - excuse my newbie idiocy.

Seems like it may have been a bad idea moving to iOS15 & Xcode 13 right now. Should I go back to 12?

Main question though is what 3rd party framework branches should be used in a final App release?