Fix PostgresHook bug when getting AWS Redshift Serverless credentials #43807
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#43669 used the wrong keys for retrieving user and password from the boto3 redshift-serverless client response, leading to
KeyErrorexceptions. This change uses the correct camel-caseddbUseranddbPasswordkeys; the boto3 redshift client response returns the Pascal-casedDbUserandDbPasswordand these were mistakenly copied into the serverless code block (and the associated test code).Unfortunately moto does not yet support redshift-serverless, which might have caught this bug in the first PR.
related: #43669