resolve setuptools_scm issue where pluggy version is 0.0.0

[RonnyPfannschmidt]

i believe its related to the setuptools_scm issue about toml vs setup.cfg integration + versions, will investigate next week

Originally posted by @RonnyPfannschmidt in #312 (comment)

[tobagin]

any news on the fix for this? I'm getting that error while trying to build a flatpak