[Enhancement] Make simhash compatible with Python>=3.9

[HYLcool]

In Python>=3.8, the field tp_print is renamed as tp_vectorcall_offset(ref). So, when install simhash-py under Python 3.9 or later, an error would occur during building like below:

simhash/simhash.cpp:2112:73: error: no member named 'tp_print' in '_typeobject'

To make simhash compatible with Python>=3.9, I add a version check when applying assignment to this field.