Bring all pyside related changes from 6.7 branch to 6.8.
Fixes: PYSIDE-2889
Change-Id: I69b692815b715ebacd9ed708d0ca64c828021d82
Reviewed-by: Ari Parkkila <ari.parkkila@qt.io>
Update python3-pytest-qt to version 4.2.0.
Pick-to: 6.7 6.6
Change-Id: Ib3cd21aaae59be4dbc02552c665e4c4f585e7cb2
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>