Update dependency ember-page-title to v9

Author: renovate[bot]

package.json

@@ -50,7 +50,7 @@
     "ember-disable-prototype-extensions": "1.1.3",
     "ember-load-initializers": "2.1.2",
     "ember-maybe-import-regenerator": "1.0.0",
-    "ember-page-title": "8.2.4",
+    "ember-page-title": "9.0.3",
     "ember-qunit": "8.1.1",
     "ember-resolver": "11.0.1",
     "ember-source": "5.12.0",