explicitly type variable whose type isn't infered from return value

Author: underchemist

oaff/app/oaff/app/data/sources/postgresql/stac_hybrid/postgresql_data_source.py

@@ -415,7 +415,7 @@ async def _get_table_temporal_extents(  # noqa: C901
         table_models: Dict[str, sa.Table],
         table_temporal_fields: Dict[str, List[TemporalInstant]],
     ) -> Dict[str, List[List[datetime]]]:
-        table_temporal_extents = {}  # type: ignore
+        table_temporal_extents: Dict[str, List[List[datetime]]] = {}
         for qualified_table_name, temporal_fields in table_temporal_fields.items():
             start = None
             end = None