FYI Gajim 1.3.3 still works on Windows 7
I was a bit upset that you decided to drop Windows 7. Apparently there isn't a specific reason for dropping apart from you using python 3.9 on Windows, right? I dug deeper and I saw you use python from msys2, right? I think python from msys2 is compiled to be able to run on Windows 7, which isn't the case for the official python binaries.
So I tested gajim 1.3.3 on Windows 7 and it seems to work.
This is to let you know about this. Also please consider not dropping Windows 7 in general for the time being. Thank you.