Update to the Qt version shipped with PyQt5

[Carlos Pereira Atencio]

Based on the latest PyPI release, I believe the latest version of PyQt5-Qt5
is still 5.15.2:
https://pypi.org/project/PyQt5-Qt5/
And the PyQt5.QtCore.QT_VERSION_STR string also indicates PyQt5 5.15.7 does
run 5.15.2.

I believe there are still some outstanding issues in 5.15.2, like this one:
https://www.riverbankcomputing.com/pipermail/pyqt/2020-December/043463.html
https://bugreports.qt.io/browse/QTBUG-88688

Which means PyQt5 applications in out-of-box Ubuntu 20.04 (and possibly one
of the Debian versions), still won't run. It sounds like this should be
fixed by updating Qt5 to something newer, would that be possible?
Thanks!
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