Update dependency ember-flatpickr to v8

Author: renovate[bot]

ember/package.json

@@ -70,7 +70,7 @@
     "ember-css-modules-sass": "1.1.0",
     "ember-event-helpers": "0.1.1",
     "ember-fetch": "8.0.4",
-    "ember-flatpickr": "3.0.1",
+    "ember-flatpickr": "8.0.1",
     "ember-freestyle": "0.12.11",
     "ember-href-to": "4.1.0",
     "ember-intl": "4.4.1",