v4.5.0 - M1 Chip support and dark theme

With this PR, we change the Qt dependency from PyQT5 to PySide6.
This allows to work on M1 chips, and seems to also offer a support for dark theme in the GUI, based on user's system preferences.

What's Changed

• refactor(lib): change PyQT5 to PySide6 by @jeertmans in #62

Full Changelog: v4.4.0...v4.5.0