Updated python versions, removed 3.7 and added 3.13 (#609) #541

Job	Run time
build (3.8)	31s
build (3.9)	45s
build (3.10)	40s
build (3.11)	26s
build (3.12)	29s
build (3.13)	38s
Indicate completion to coveralls.io	12s
	3m 41s

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