Test and deploy on tag

Add support for Sphinx 8; Drop support for Python 3.7 #560

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Run time

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Job	Run time
test (3.8)	3m 4s
test (3.9)	2m 54s
test (3.10)	2m 54s
test (3.11)	2m 44s
test (3.12)	2m 56s
deploy	0s
	14m 32s