Add Python 3.12 Support #775

Job	Run time
Linux centos 7	6s
Linux fedora latest	4m 31s
Native Linux (WError)	5m 3s
Native Linux (libc++ debug)	5m 21s
Native Linux (c++17)	5m 1s
Cross mingw64 DLL	11m 9s
Cross mingw64 static	11m 20s
RTEMS5	14m 45s
Native Linux with clang	4m 38s
Native Linux with clang ubsan	5m 4s
Native Linux with libevent stable	4m 28s
Native Linux with 7.0.2	5m 4s
Native Linux with 3.15	4m 5s
Native Linux with 3.14	6m 28s
OSX	3m 37s
vs2019 DLL	8m 42s
vs2019 static	8m 52s
	1h 48m 14s

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