Python2 is removed from Debian stable/unstable and
latest Ubuntu. So, we need to use a newest version of
Qt (here Qt 6.4.3).

Change-Id: I6c8b1eee644aab787d54e467f64011762ffd7548

Ubuntu 23.04 is not yet functional due to python2 missing.
We're working on fixing Jami for Qt 6.4 (they changed the whole video
pipeline and introduced some breaking changes).
Fedora 38 is working fine.

GitLab: #1086
Change-Id: I51bbecdfbcf908e2bf57c4c002ef4216a34d746d