fix: Set keepalives_idle None by default (feast-dev#3756)

set keepalives_idle None by default

Co-authored-by: Nikita Demashov <n.demashov@yadro.com>

Author: ndemashov

sdk/python/feast/infra/utils/postgres/postgres_config.py

@@ -25,4 +25,4 @@ class PostgreSQLConfig(FeastConfigBaseModel):
     sslkey_path: Optional[StrictStr] = None
     sslcert_path: Optional[StrictStr] = None
     sslrootcert_path: Optional[StrictStr] = None
-    keepalives_idle: int = 0
+    keepalives_idle: Optional[int] = None