Support the deprecation of asyncore in python 3.12 #593

Job	Run time
Build source distribution	10s
Build wheels ubuntu-latest (x86_64)	26m 48s
Build wheels ubuntu-latest (i686)	16m 11s
Build wheels ubuntu-latest (PyPy)	2m 22s
Build wheels windows-latest (win32)	39m 32s
Build wheels windows-latest (win64)	28m 52s
Build wheels windows-latest (PyPy)	5m 36s
Build wheels macos-latest (all)	16m 17s
Build wheels macos-latest (PyPy)	2m 42s
upload_pypi	0s
	2h 18m 30s

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