Bump sphinxext-opengraph from 0.9.0 to 0.9.1 #1012

Job	Run time
prepare	3s
tests (avalanche-ewc.json) / run	5m 6s
tests (avalanche-er.json) / run	4m 16s
tests (avalanche-icarl.json) / run	3m 36s
tests (avalanche-lwf.json) / run	3m 40s
tests (cls-er.json) / run	3m 45s
tests (der.json) / run	5m 38s
tests (er.json) / run	4m 57s
tests (fine-tuning.json) / run	3m 34s
tests (gdumb.json) / run	3m 20s
tests (joint.json) / run	4m 5s
tests (offline-er.json) / run	4m 34s
tests (pod-er.json) / run	6m 3s
tests (super-er.json) / run	4m 30s
	57m 7s

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