Fix: Make postgres keepalives_idle optional for dbt projects (#1180)

Author: crericha

sqlmesh/dbt/target.py

@@ -257,7 +257,7 @@ class PostgresConfig(TargetConfig):
     password: str
     port: int
     dbname: str
-    keepalives_idle: int = 0
+    keepalives_idle: t.Optional[int] = None
     connect_timeout: int = 10
     retries: int = 1  # Currently Unsupported by SQLMesh
     search_path: t.Optional[str] = None  # Currently Unsupported by SQLMesh