Add Python 3.12 Support #774

Job	Run time
Linux centos 7	8s
Native Linux (WError)	5m 15s
Linux fedora latest	4m 17s
Native Linux (libc++ debug)	5m 50s
Native Linux (c++17)	5m 10s
Cross mingw64 DLL	6m 36s
Cross mingw64 static	6m 15s
RTEMS5	6m 12s
Native Linux with clang	4m 38s
Native Linux with clang ubsan	4m 58s
Native Linux with libevent stable	4m 54s
Native Linux with 7.0.2	4m 46s
Native Linux with 3.15	4m 5s
Native Linux with 3.14	6m 1s
OSX	3m 24s
vs2019 DLL	6m 3s
vs2019 static	6m 7s
	1h 24m 39s

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