Add Python 3.12 Support #776

Job	Run time
Linux centos 7	11s
Linux fedora latest	4m 14s
Native Linux (WError)	5m 41s
Native Linux (libc++ debug)	5m 43s
Native Linux (c++17)	4m 56s
Cross mingw64 DLL	10m 30s
Cross mingw64 static	11m 28s
RTEMS5	14m 6s
Native Linux with clang	4m 49s
Native Linux with clang ubsan	5m 11s
Native Linux with libevent stable	4m 53s
Native Linux with 7.0.2	4m 50s
Native Linux with 3.15	3m 59s
Native Linux with 3.14	6m 3s
OSX	3m 54s
vs2019 DLL	9m 0s
vs2019 static	9m 46s
	1h 49m 14s

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