sqlalchemy 2.x: use attrs not strings for joining

https://docs.sqlalchemy.org/en/20/changelog/migration_20.html#orm-query-joining-loading-on-relationships-uses-attributes-not-strings

Signed-off-by: Taylor Madore <tmadore@redhat.com>
Signed-off-by: Ben Alkov <ben.alkov@redhat.com>

cachito/web/api_v1.py

@@ -780,7 +780,7 @@ def _get_valid_request_ids(all_request_ids: str) -> List[int]:
 def _get_all_requests(request_ids: List[int]) -> list[Request]:
     requests = (
         Request.query.filter(Request.id.in_(request_ids))
-        .options(load_only("id"), joinedload(Request.state))
+        .options(load_only(Request.id), joinedload(Request.state))  # type: ignore[arg-type]
         .all()
     )