Bump sphinx-hoverxref from 1.3.0 to 1.4.0 #1023

Job	Run time
prepare	4s
tests (avalanche-er.json) / run	4m 31s
tests (avalanche-ewc.json) / run	4m 57s
tests (avalanche-icarl.json) / run	3m 37s
tests (avalanche-lwf.json) / run	3m 30s
tests (cls-er.json) / run	3m 54s
tests (der.json) / run	5m 33s
tests (er.json) / run	4m 48s
tests (fine-tuning.json) / run	3m 26s
tests (gdumb.json) / run	4m 37s
tests (joint.json) / run	3m 56s
tests (offline-er.json) / run	4m 29s
tests (pod-er.json) / run	6m 49s
tests (super-er.json) / run	4m 33s
	58m 44s

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