To avoid a misunderstanding. DietPi is not an own operating system that is built on some source. It’s just a set of scripts running on Debian and we use Debian global package repository. Debian -- Packages
We don’t maintain, build or manage any of these packages. Furthermore, DietPi version has no relation to any Debian package version. These are completely different thinks.
For 32bit RPi, we use Raspberry OS (source packages).