update to v4.12 with ember-cli-update #39

Job	Run time
Tests	40s
Floating Dependencies	2m 54s
ember-lts-3.16	48s
ember-lts-3.20	30s
ember-lts-3.24	37s
ember-lts-3.28	34s
ember-lts-4.4	30s
ember-lts-4.8	49s
ember-release	40s
ember-beta	39s
ember-canary	40s
ember-classic	31s
embroider-safe	32s
embroider-optimized	39s
no-deprecations	30s
ember-release-no-deprecations	34s
	12m 7s

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