[AIRFLOW-XXX] fix gcp keyfile_dict typo (#6962)
[AIRFLOW-XXX] fix gcp keyfile_dict typo (#6962)


(cherry picked from commit 9cd8fea34d9be9e574711b563ff4137f305bdc53)

owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow