style(mypy): Spit-and-polish pass (#10001)

Co-authored-by: John Bodley <john.bodley@airbnb.com>

superset/db_engine_specs/postgres.py

@@ -51,7 +51,7 @@ class PostgresBaseEngineSpec(BaseEngineSpec):
     }
 
     @classmethod
-    def fetch_data(cls, cursor: Any, limit: int) -> List[Tuple]:
+    def fetch_data(cls, cursor: Any, limit: int) -> List[Tuple[Any, ...]]:
         cursor.tzinfo_factory = FixedOffsetTimezone
         if not cursor.description:
             return []