drop python 3.8 #821

Job	Run time
Test install with generated cython files	3m 57s
Test installation using system supplied libs	3m 52s
Python 3.9	5m 43s
Python 3.9	7m 9s
Test sse2 code on Linux (gcc)	7m 24s
Test installation using newest version of Taskflow	3m 53s
Python 3.9	8m 5s
Python 3.10	5m 51s
Python 3.10	8m 47s
Python 3.10	7m 2s
Python 3.11	5m 46s
Python 3.11	8m 31s
Python 3.11	6m 33s
Python 3.12	5m 58s
Python 3.12	8m 14s
Python 3.12	7m 16s
Python 3.13	7s
Python 3.13	21s
Python 3.13	19s
	1h 44m 48s

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