CI/CD

Bump follow-redirects from 1.15.3 to 1.15.4 (#1540) #1811

Job	Run time
Lint files	51s
Test addon (floating dependencies) (ember)	1m 10s
Test addon (locked dependencies) (ember)	1m 10s
Test addon (floating dependencies) (node)	1m 12s
Test compatibility (ember-lts-4.4)	1m 12s
Test addon (locked dependencies) (node)	52s
Test addon (floating dependencies) (test-apps)	1m 10s
Test addon (locked dependencies) (test-apps)	1m 5s
Test compatibility (ember-lts-4.8)	1m 12s
Test compatibility (ember-lts-4.12)	1m 12s
Test compatibility (ember-release)	1m 11s
Test compatibility (ember-beta)	1m 11s
Test compatibility (ember-canary)	1m 12s
Test compatibility (embroider-safe)	1m 12s
Deploy app	1s
	15m 53s

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