Support Swift6 version to Birthday sample app. #885

Job	Run time
grab-pr-body	4s
app-check-api-token-tests	0s
check-pr-body-for-key	2s
swift-button-functional-test	0s
grab-pr-body	4s
app-check-api-token-tests	0s
check-pr-body-for-key	4s
swift-button-functional-test	0s
	14s

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