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BUG: Remove deprecated Qt6 paradigms #506

Job	Run time
oldschool (rockylinux, 9, release)	4m 41s
macOS (latest, 3.9, 5.9.*, release)	12m 22s
ubuntu (22.04)	18m 12s
ubuntu (24.04)	18m 58s
macOS (latest, 3.9, 5.9.*, debug)	9m 34s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 38s
oldschool (rockylinux, 9, debug)	4m 23s
macOS (latest, 3.11, 5.12.*, debug)	6m 48s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 6s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 45s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	3m 44s
	1h 35m 11s

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