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Use Qt 6 for macOS workflow #762

Job	Run time
macOS (latest, 3.9, 6.11.*, release)	15s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	42s
macOS (latest, 3.11, 6.11.*, debug)	21s
oldschool (rockylinux, 9, release)	41s
oldschool (rockylinux, 9, debug)	40s
ubuntu (22.04)	42s
windows (win32_mingw53, 3.6, x86, 5.11.*)	44s
ubuntu (24.04)	41s
macOS (latest, 3.9, 6.11.*, debug)	22s
windows (win64_mingw73, 3.10, 5.12.*, x64)	42s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	42s
	6m 32s

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