Add an Ubuntu 24.0 build with native Python3.12 #88

Job	Run time
altlinux	4m 17s
ubuntu (20.04)	16m 4s
oldschool (centos, 7, python-debug, debug)	2m 21s
macOS (12, 3.9, 5.9.*, release)	1s
ubuntu (22.04)	10m 43s
oldschool (centos, 7, python-debug, release)	2m 18s
macOS (12, 3.9, 5.9.*, debug)	1s
ubuntu (24.04)	6m 4s
windows (win64_mingw73, 3.10, 5.12.*, x64)	5m 19s
oldschool (rockylinux, 9, python3-devel, release)	4m 17s
macOS (12, 3.11, 5.12.*, debug)	1s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	4m 21s
windows (win64_msvc2019_64, 3.12, x64, 5.15.*, PythonQtCore PythonQtGui PythonQtMultimedia)	3m 29s
windows (win32_mingw53, 3.6, x86, 5.11.*)	6m 51s
	1h 6m 7s

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