build(deps-dev): bump gulp-zip from 5.1.0 to 6.0.0 #5484

Job	Run time
Test	2m 23s
Build extensions	1m 39s
ember-try (ember-lts-3.16)	1m 13s
ember-try (ember-lts-3.20)	1m 27s
ember-try (ember-lts-3.24)	1m 29s
ember-try (ember-lts-3.28)	1m 31s
ember-try (ember-release)	1m 26s
ember-try (ember-beta)	1m 26s
ember-try (ember-canary)	1m 21s
ember-try (ember-default-no-prototype-extensions)	1m 17s
Publish Chrome extension	5s
Publish Firefox extension	26s
Publish GitHub release	0s
Publish bookmarklet	0s
Publish npm package	5s
	15m 48s

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