[stdilb][sys.monitoring] Change return type of set_local_events to None
#15216
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docs: https://docs.python.org/dev/library/sys.monitoring.html#sys.monitoring.set_local_events
src: https://github.com/python/cpython/blob/c99f7667436d8978b4077704333e2a351f2a026f/Python/clinic/instrumentation.c.h#L295
https://github.com/python/cpython/blob/c99f7667436d8978b4077704333e2a351f2a026f/Python/instrumentation.c#L2431