Update dependency @release-it-plugins/workspaces to v4 #2375

Job	Run time
Tests	4m 15s
Floating dependencies	1m 35s
ember-try: ember-lts-3.28	2m 4s
ember-try: ember-lts-4.4	1m 34s
ember-try: ember-release	1m 31s
ember-try: ember-beta	2m 20s
ember-try: ember-canary	3m 0s
ember-try: embroider-safe	1m 33s
ember-try: embroider-optimized	1m 30s
ember-try: ember-classic	1m 36s
	20m 58s

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