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Add support for Qt 6.7 #399

Job	Run time
macOS (11, 3.6, 5.9.*, release)	19m 39s
oldschool (centos, 7, python-debug, debug)	4m 56s
ubuntu (20.04)	21m 20s
oldschool (centos, 7, python-debug, release)	5m 32s
ubuntu (22.04)	18m 5s
oldschool (rockylinux, 9, python3-devel, release)	4m 25s
macOS (11, 3.6, 5.9.*, debug)	7m 12s
windows (win64_mingw73, 3.10, 5.12.*, x64)	6m 8s
macOS (12, 3.11, 5.12.*, debug)	3m 30s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	5m 10s
windows (win64_msvc2019_64, 3.12, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	4m 0s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 22s
	1h 46m 19s

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