Update dependency rollup-plugin-copy to v3.5.0 #2321

Job	Run time
Tests	1m 27s
Floating dependencies	1m 55s
ember-try: ember-lts-3.28	1m 35s
ember-try: ember-lts-4.4	1m 26s
ember-try: ember-release	2m 0s
ember-try: ember-beta	2m 16s
ember-try: ember-canary	1m 33s
ember-try: embroider-safe	1m 38s
ember-try: embroider-optimized	1m 30s
ember-try: ember-classic	2m 8s
	17m 28s

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