@babel/core dependency is not needed #629

Job	Run time
Tests	54s
Floating Dependencies	46s
ember-lts-3.28	1m 5s
ember-lts-4.4	50s
ember-lts-4.8	1m 14s
ember-lts-4.12	44s
ember-lts-5.4	48s
ember-release	1m 0s
ember-beta	51s
ember-canary	51s
no-deprecations	56s
ember-release-no-deprecations	47s
embroider-safe	1m 42s
embroider-optimized	49s
ember-modifier-3.2.7	48s
	14m 5s

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