chore(deps-dev): bump ember-page-title from 7.0.0 to 8.0.0 #569

Job	Run time
Tests	1m 42s
Floating Dependencies	1m 39s
ember-try: ember-lts-3.28	1m 33s
ember-try: ember-lts-4.4	1m 22s
ember-try: ember-release	1m 30s
ember-try: ember-beta	1m 30s
ember-try: ember-canary	1m 46s
ember-try: ember-classic	1m 55s
ember-try: embroider-safe	1m 46s
ember-try: embroider-optimized	1m 30s
	16m 13s

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