tests/test_evol.py: port assertions to python3.12. #737
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As first identified in Debian bug #1058334 affecting ete3, since introduction of Python 3.12, a number of tests are failing with errors looking like:
This is because the newer version of the unittest module of the standard library removed the use of deprecated assert_ function for other ones more meaningful, as documented in Python 3.12 novelties. It appears that there are still a few assert_ occurrences remaining in ete4 source code, so this patch modernizes them.