Build

Use Qt 6 for macOS workflow #767

Job	Run time
ubuntu (22.04)	6m 5s
ubuntu (24.04)	7m 40s
oldschool (rockylinux, 9, debug)	5m 25s
windows (win64_msvc2019_64, 3.13, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 1s
macOS (3.13, 6.11.*, debug)	1h 17m 43s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	5m 12s
macOS (3.13, 6.11.*, release)	1h 33m 42s
windows (win64_mingw73, 3.10, 5.12.*, x64)	4m 56s
oldschool (rockylinux, 9, release)	13m 21s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 59s
	3h 45m 4s

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