fix: fix unsupported operand

[tlambert03]

fixes unsupported operand type(s) for &: 'PySide6.QtCore.QKeyCombination' and 'KeyboardModifier' on the newest pyside6

side-note: fixes in https://github.com/napari/superqt/pull/133 should get pyside6 tests working again

[codecov]

Codecov Report

Merging #76 (eb3e98f) into main (4c20668) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   99.35%   99.35%           
=======================================
  Files          31       31           
  Lines        1707     1707           
=======================================
  Hits         1696     1696           
  Misses         11       11           

Impacted Files	Coverage Δ
src/app_model/backends/qt/_qkeymap.py	100.00% <100.00%> (ø)

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[aganders3]

This looks good to me. Tests pass locally (macOS) with both PyQt6 and PySide6.

One nit is that PYQT6 is now unused in this file so can be removed from the import.