chore(deps): update actions/checkout digest to d23441a #5128

Job	Run time
Lint Test App	26s
Tests (Floating Dependencies)	1m 40s
Lint Addon	33s
ember-beta - Allowed to fail	40s
embroider-optimized - Allowed to fail	1m 6s
ember-canary - Allowed to fail	36s
Tests (ember-lts-4.4, false)	1m 8s
Tests (ember-default, false)	1m 11s
Tests (embroider-safe, false)	1m 2s
Tests (ember-lts-5.8, false)	1m 14s
Tests (ember-lts-4.8, false)	1m 27s
Tests (ember-4.12, false)	1m 11s
Tests (ember-4.0, false)	1m 9s
Tests (ember-release, false)	28s
	13m 51s

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