Fix auth code expiry parsing #6463

Job	Run time
build-and-check	3m 13s
test-integration-packages/internal	1m 13s
test-integration-packages/billing	1m 14s
test-integration-common	43s
test-integration-web	49s
test-integration-sdk	1m 17s
test-.agents	45s
test-packages/billing	38s
test-integration-packages/agent-runtime	46s
test-packages/agent-runtime	41s
test-cli	53s
test-integration-cli	42s
test-sdk	54s
test-packages/internal	49s
test-web	1m 16s
test-common	39s
	16m 32s

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