Bump pytest-cov from 4.1.0 to 5.0.0 #1066

Job	Run time
prepare	4s
tests (avalanche-er.json) / run	4m 14s
tests (avalanche-ewc.json) / run	4m 49s
tests (avalanche-icarl.json) / run	3m 32s
tests (avalanche-lwf.json) / run	3m 38s
tests (cls-er.json) / run	3m 30s
tests (der.json) / run	5m 14s
tests (er.json) / run	4m 34s
tests (fine-tuning.json) / run	5m 21s
tests (gdumb.json) / run	3m 10s
tests (joint.json) / run	3m 41s
tests (offline-er.json) / run	7m 5s
tests (pod-er.json) / run	6m 0s
tests (super-er.json) / run	4m 18s
	59m 10s

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