use version 3.8.0 for now

Author: mwbayley

airbyte-integrations/connectors/source-postgres/metadata.yaml

@@ -9,7 +9,7 @@ data:
   connectorSubtype: database
   connectorType: source
   definitionId: decd338e-5647-4c0b-adf4-da0e75f5a750
-  dockerImageTag: 4.0.0
+  dockerImageTag: 3.8.0
   dockerRepository: airbyte/source-postgres
   documentationUrl: https://docs.airbyte.com/integrations/sources/postgres
   githubIssueLabel: source-postgres