Tests

MAINT: Fixes for VTK-9.4 #228

Job	Run time
tests (ubuntu-latest, 3.9, pyqt5, vtk<9.3)	1m 51s
tests (windows-latest, 3.9, pyqt5, vtk<9.3)	3m 30s
tests (macos-13, 3.9, pyqt5, vtk<9.3)	1m 51s
tests (3.12, pyqt6, ubuntu-latest, vtk>=9.3)	1m 51s
tests (3.12, pyqt6, macos-14, vtk>=9.3)	1m 35s
tests (3.12, pyqt6, windows-latest, vtk>=9.3)	3m 37s
tests (3.11, pyqt6, ubuntu-latest, vtk>=9.3)	1m 48s
tests (3.10, pyside6, ubuntu-latest, vtk<9.3)	1m 44s
tests (3.10, pyside6, windows-latest, vtk<9.3)	3m 7s
tests (3.10, pyside6, macos-13, vtk<9.3)	3m 53s
tests (3.12, pyside6, ubuntu-latest, vtk>=9.3, numpy==1.26.4)	2m 7s
tests (3.12, pyside6, windows-latest, vtk>=9.3, numpy==2.0.2)	3m 38s
tests (3.12, pyside6, windows-latest, vtk>=9.3, numpy==1.26.4)	3m 16s
	33m 48s

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