Qt 6 support

[altendky]

Stalled on:

• https://bugreports.qt.io/browse/PYSIDE-1431
  https://codereview.qt-project.org/c/pyside/pyside-setup/+/360992
• Release of above

Draft for:

• Update PySide6 requirements for above fix.

[codecov]

Codecov Report

Merging #255 (5f5070e) into main (966531f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #255   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           35        35           
  Lines         2023      2032    +9     
  Branches       138       138           
=========================================
+ Hits          2023      2032    +9     

Impacted Files	Coverage Δ
qtrio/_tests/helpers.py	100.00% <ø> (ø)
qtrio/examples/readme/qt.py	100.00% <ø> (ø)
qtrio/examples/readme/qtrio_example.py	100.00% <ø> (ø)
qtrio/_core.py	100.00% <100.00%> (ø)
qtrio/_qt.py	100.00% <100.00%> (ø)
qtrio/_tests/examples/readme/test_qt.py	100.00% <100.00%> (ø)
qtrio/_tests/examples/test_crossingpaths.py	100.00% <100.00%> (ø)
qtrio/_tests/test_core.py	100.00% <100.00%> (ø)
qtrio/_tests/test_dialogs.py	100.00% <100.00%> (ø)
qtrio/_tests/test_qt.py	100.00% <100.00%> (ø)
... and 2 more

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[altendky]

SignalInstance equality checks broken in PySide 5.15.2+ including 6.
https://bugreports.qt.io/browse/PYSIDE-1431

[xaberus]

Hi, what is the current status for this? The tests from the qt6 branch seem to pass on pyside6-6.5.2, but I have not taken a close look at the bug report mentioned up top. Is there a dedicated test that checks for signal equality? Or is there another reason why this PR is stalled?