Some compatibility issues when using latest PyQt6 or PySide6 (6.5+)

[dalthviz]

Checking around seems like the latest version of the Qt 6 bindings (6.5.2 I think) come with some changes (related with deprecations) that can cause some errors. Some examples:

• [Qt6, PyQt6] AttributeError: type object 'QFileDialog' has no attribute 'Options' napari/napari#6060
• [Qt6, pyside6] QAction has no attribute menu in fresh napari install napari/napari#6135
• Lock dimensions / axes while rolling napari/napari#5986 (comment) (Qt.ItemFlags vs Qt.ItemFlag - PyQt6)
• Qtconsole quits when trying to drag in PyQt6 jupyter/qtconsole#583 (comment) (QDragMoveEvent.pos vs QDragMoveEvent.position)

I think it could be worthy to check if something from the QtPy side could be done and include it in v2.4.0. Also, testing on the CI with Qt 6.5 seems worthy and could help us see if there are any other errors/changes to be done.

Other relevant related work in progress:

• PR: Initial fixes to make Spyder work with Qt 6 spyder#21227 (comment)

What do you think @ccordoba12 @CAM-Gerlach ?

[ccordoba12]

If we can help to provide more compatibility with Qt6, I'm ok with it.