Python 2 support and 3.13

The following packages in community require python2:

chromium
kodi
py2-setuptools
qt5-qtwebengine
py-bluez
rdiff-backup1

The following packages in testing require python2:

thunderbird
mame
seamonkey

Maybe it is possible to adjust the necessary packages and move python2 from main to community before 3.13 is released. Moving it from community to testing or removing it entirely is probably not feasible at this point. Supporting python2 for the next 2 years seems very unrealistic to me.