Update dependency ember-template-lint to v7 #1509

Job	Run time
Floating Dependencies	1m 28s
Tests	46s
ember-lts-3.28	58s
ember-beta	52s
ember-release	44s
ember-lts-4.8	43s
ember-lts-5.12	59s
ember-lts-4.4	47s
ember-lts-4.12	41s
embroider-safe	1m 3s
no-deprecations	44s
embroider-optimized	50s
ember-canary	55s
ember-modifier-3.2.7	51s
ember-release-no-deprecations	56s
	13m 17s

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