Update dependency ember-page-title to v9 #1478

Job	Run time
Floating Dependencies	45s
Tests	1m 5s
ember-lts-4.4	1m 7s
ember-lts-3.28	1m 4s
no-deprecations	50s
ember-lts-5.12	44s
ember-release-no-deprecations	44s
ember-beta	1m 4s
embroider-optimized	1m 24s
ember-lts-4.12	56s
ember-release	45s
ember-lts-4.8	43s
embroider-safe	46s
ember-canary	49s
ember-modifier-3.2.7	57s
	13m 43s

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