Tests and continuous integration: Fixed issues and updated CI configuration #1648

Job	Run time
Python 3.8 on ubuntu-20.04 PyQt5	3m 34s
Python 3.11 on ubuntu-latest PyQt6	3m 30s
Python 3.12 on ubuntu-latest PySide6	3m 30s
Python 3.10 on macos-13 PyQt5	7m 2s
Python 3.12 on macos-13 PyQt6	6m 13s
Python 3.9 on macos-13 PySide6	6m 45s
Python 3.9 on windows-latest PyQt5	3m 11s
Python 3.12 on windows-latest PyQt6	4m 0s
Python 3.10 on windows-latest PySide6	3m 54s
	41m 39s

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