refactor: Update API resource URLs to use route_id variable

Author: Ahmedhossamdev

src/onebusaway/resources/stops_for_route.py

@@ -65,7 +65,7 @@ def list(
         if not route_id:
             raise ValueError(f"Expected a non-empty value for `route_id` but received {route_id!r}")
         return self._get(
-            f"/api/where/stops-for-route/routeID.json",
+            f"/api/where/stops-for-route/{route_id}.json",
             options=make_request_options(
                 extra_headers=extra_headers,
                 extra_query=extra_query,
@@ -124,7 +124,7 @@ async def list(
         if not route_id:
             raise ValueError(f"Expected a non-empty value for `route_id` but received {route_id!r}")
         return await self._get(
-            f"/api/where/stops-for-route/routeID.json",
+            f"/api/where/stops-for-route/{route_id}.json",
             options=make_request_options(
                 extra_headers=extra_headers,
                 extra_query=extra_query,