chore(deps): update actions/checkout action to v7 #5130

Job	Run time
ember-beta - Allowed to fail	39s
Lint Addon	33s
ember-canary - Allowed to fail	42s
embroider-optimized - Allowed to fail	1m 19s
Tests (ember-lts-5.8, false)	1m 15s
Lint Test App	27s
Tests (Floating Dependencies)	56s
Tests (ember-default, false)	58s
Tests (ember-release, false)	34s
Tests (ember-4.0, false)	1m 21s
Tests (embroider-safe, false)	1m 15s
Tests (ember-lts-4.4, false)	1m 5s
Tests (ember-lts-4.8, false)	1m 2s
Tests (ember-4.12, false)	1m 18s
	13m 24s

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