build(deps-dev): bump follow-redirects from 1.15.4 to 1.15.6 #5719

Job	Run time
Test	2m 7s
Build extensions	1m 27s
ember-try (ember-lts-3.16)	1m 6s
ember-try (ember-lts-3.20)	1m 14s
ember-try (ember-lts-3.24)	1m 15s
ember-try (ember-lts-3.28)	1m 16s
ember-try (ember-release)	1m 30s
ember-try (ember-beta)	1m 16s
ember-try (ember-canary)	1m 12s
ember-try (ember-default-no-prototype-extensions)	1m 11s
Publish Chrome extension	8s
Publish npm package	9s
Publish Firefox extension	26s
Publish bookmarklet	0s
Publish GitHub release	0s
	14m 17s

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