upgrade cython #566

Job	Run time
Test install with generated cython files	4m 35s
Test installation using system supplied libs	30s
Test sse2 code on Linux (gcc)	18m 19s
Test installation using newest version of Taskflow	30s
Python 3.7	6m 27s
Python 3.7	8m 17s
Python 3.7	10m 36s
Python 3.8	6m 26s
Python 3.8	10m 31s
Python 3.8	10m 45s
Python 3.9	7m 27s
Python 3.9	8m 34s
Python 3.9	9m 49s
Python 3.10	5m 49s
Python 3.10	7m 59s
Python 3.10	11m 41s
Python 3.11	6m 15s
Python 3.11	7m 59s
Python 3.11	9m 46s
	2h 32m 15s

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