Tests and continuous integration: Fixed issues and updated CI configuration #1649

Job	Run time
Python 3.8 on ubuntu-20.04 PyQt5	3m 34s
Python 3.11 on ubuntu-latest PyQt6	3m 29s
Python 3.12 on ubuntu-latest PySide6	3m 25s
Python 3.10 on macos-13 PyQt5	3m 49s
Python 3.12 on macos-13 PyQt6	13m 49s
Python 3.9 on macos-13 PySide6	7m 38s
Python 3.9 on windows-latest PyQt5	3m 3s
Python 3.12 on windows-latest PyQt6	4m 19s
Python 3.10 on windows-latest PySide6	2m 58s
	46m 4s

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