Bump sphinx-autodoc-typehints from 1.25.2 to 2.4.1 #1115

Job	Run time
prepare	4s
tests (avalanche-ewc.json) / run	4m 50s
tests (avalanche-er.json) / run	4m 12s
tests (avalanche-icarl.json) / run	4m 23s
tests (avalanche-lwf.json) / run	3m 3s
tests (cls-er.json) / run	4m 40s
tests (der.json) / run	5m 28s
tests (er.json) / run	4m 51s
tests (fine-tuning.json) / run	5m 20s
tests (gdumb.json) / run	4m 37s
tests (joint.json) / run	4m 0s
tests (offline-er.json) / run	4m 48s
tests (pod-er.json) / run	6m 42s
tests (super-er.json) / run	4m 17s
	1h 1m 15s

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