chore(deps): update dependency ember-source to v6. Add peerDependency on `>= 6.0` #4054

Job	Run time
Lint Addon	28s
Lint Test App	28s
Tests (Floating Dependencies)	1m 7s
Tests (ember-lts-4.4, false)	1m 3s
Tests (ember-4.0, false)	1m 8s
Tests (ember-4.12, false)	1m 16s
Tests (ember-release, false)	1m 45s
Tests (embroider-safe, false)	33s
Tests (ember-lts-4.8, false)	1m 1s
embroider-optimized - Allowed to fail	36s
Tests (ember-default, false)	1m 12s
ember-beta - Allowed to fail	1m 27s
Tests (ember-lts-5.8, false)	1m 21s
ember-canary - Allowed to fail	1m 17s
	14m 42s

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