Bump sphinx from 7.2.6 to 7.4.4 #1071

Job	Run time
prepare	3s
tests (avalanche-icarl.json) / run	3m 26s
tests (avalanche-ewc.json) / run	4m 59s
tests (avalanche-er.json) / run	3m 53s
tests (avalanche-lwf.json) / run	3m 5s
tests (cls-er.json) / run	3m 37s
tests (der.json) / run	5m 3s
tests (er.json) / run	4m 41s
tests (fine-tuning.json) / run	2m 58s
tests (gdumb.json) / run	5m 27s
tests (joint.json) / run	3m 49s
tests (offline-er.json) / run	4m 34s
tests (pod-er.json) / run	6m 6s
tests (super-er.json) / run	4m 47s
	56m 28s

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