python-traitlets: update to 5.2.1, port to pyproject
python-traitlets: update to 5.2.1, port to pyproject

* Add python-hatchling in makedepends
* Get source tarball from pypi
JPeterMugaas/MINGW-packages,oroppas/MINGW-packages,lhmouse/MINGW-packages,fabiangreffrath/MINGW-packages,stahta01/MINGW-packages,oscarfv/MINGW-packages,Alexpux/MINGW-packages,oroppas/MINGW-packages,stahta01/MINGW-packages,Alexpux/MINGW-packages,JPeterMugaas/MINGW-packages,lhmouse/MINGW-packages,fabiangreffrath/MINGW-packages,fabiangreffrath/MINGW-packages,stahta01/MINGW-packages,Alexpux/MINGW-packages,oscarfv/MINGW-packages,lhmouse/MINGW-packages,Alexpux/MINGW-packages,JPeterMugaas/MINGW-packages,fabiangreffrath/MINGW-packages,stahta01/MINGW-packages,JPeterMugaas/MINGW-packages,fabiangreffrath/MINGW-packages,oroppas/MINGW-packages,oscarfv/MINGW-packages,oroppas/MINGW-packages,oroppas/MINGW-packages,oscarfv/MINGW-packages,Alexpux/MINGW-packages,lhmouse/MINGW-packages,stahta01/MINGW-packages,Alexpux/MINGW-packages,oscarfv/MINGW-packages,lhmouse/MINGW-packages,stahta01/MINGW-packages,lhmouse/MINGW-packages,oroppas/MINGW-packages,fabiangreffrath/MINGW-packages,JPeterMugaas/MINGW-packages,oscarfv/MINGW-packages,JPeterMugaas/MINGW-packages