Update dependency ember-page-title to v8 #2479

Job	Run time
Tests	1m 52s
Floating dependencies	1m 11s
ember-try: ember-lts-3.28	3m 12s
ember-try: ember-lts-4.4	1m 31s
ember-try: ember-release	1m 27s
ember-try: ember-beta	1m 51s
ember-try: ember-canary	1m 30s
ember-try: embroider-safe	1m 40s
ember-try: embroider-optimized	1m 28s
ember-try: ember-classic	1m 23s
	17m 5s

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