chore(deps-dev): bump ember-page-title from 7.0.0 to 8.0.0 #547

Job	Run time
Tests	1m 34s
Floating Dependencies	2m 1s
ember-try: ember-lts-3.28	3m 14s
ember-try: ember-lts-4.4	1m 26s
ember-try: ember-release	1m 26s
ember-try: ember-beta	1m 35s
ember-try: ember-canary	1m 56s
ember-try: ember-classic	1m 51s
ember-try: embroider-safe	1m 43s
ember-try: embroider-optimized	1m 31s
	18m 17s

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