Tests and continuous integration: Fixed issues and updated CI configuration #1652

Job	Run time
Python 3.8 on ubuntu-20.04 PyQt5	9m 51s
Python 3.11 on ubuntu-latest PyQt6	8m 29s
Python 3.12 on ubuntu-latest PySide6	7m 53s
Python 3.10 on macos-13 PyQt5	13m 16s
Python 3.12 on macos-13 PyQt6	26m 19s
Python 3.9 on macos-13 PySide6	15m 44s
Python 3.9 on windows-latest PyQt5	11m 16s
Python 3.12 on windows-latest PyQt6	11m 35s
Python 3.10 on windows-latest PySide6	8m 18s
	1h 52m 41s

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