Upgrade Ember to v5.5.0 #485

Job	Run time
Tests	1m 46s
Floating Dependencies	1m 15s
Build Tests	2m 37s
Scenario: ember-lts-3.28 \| optional: false	38s
Scenario: ember-lts-4.4 \| optional: false	2m 46s
Scenario: ember-lts-4.8 \| optional: false	2m 45s
Scenario: ember-lts-4.12 \| optional: false	2m 45s
Scenario: ember-release \| optional: false	2m 44s
Scenario: ember-beta \| optional: false	2m 46s
Scenario: ember-classic \| optional: false	2m 45s
Scenario: ember-canary \| optional: true	2m 45s
Scenario: embroider-safe \| optional: true	2m 44s
Scenario: embroider-optimized \| optional: true	2m 45s
	31m 1s

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