Use pyasyncore and pyasynchat for python>3.11

Jim Newsomerequested to merge
jnewsome/chutney:pyasyncore into main

Workaround for #40019 (closed)

Locally verified that this fixes chutney verify on python 3.12 (using an ubuntu container). Opened #40031 to test a newer version of python in our CI.

Edited by Jim Newsome

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