chore(deps): update dependency @embroider/addon-dev to v7 #714

Job	Run time
Floating Dependencies	50s
Tests	53s
ember-lts-3.28	49s
ember-lts-4.4	46s
ember-lts-4.8	1m 2s
ember-lts-4.12	48s
ember-lts-5.4	53s
ember-release	49s
ember-beta	51s
ember-canary	52s
no-deprecations	1m 7s
ember-release-no-deprecations	49s
embroider-safe	51s
embroider-optimized	1m 13s
ember-modifier-3.2.7	55s
	13m 28s

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