fix f-string missing from warning string

src/qcodes/dataset/data_set_in_memory.py

@@ -349,7 +349,7 @@ def _set_cache_from_netcdf(cls, ds: DataSetInMem, xr_path: Path | None) -> bool:
         elif xr_path is not None and not xr_path.is_file():
             success = False
             warnings.warn(
-                "Could not load raw data for dataset with guid : {ds.guid} from location {xr_path}"
+                f"Could not load raw data for dataset with guid : {ds.guid} from location {xr_path}"
             )
         else:
             warnings.warn(f"No raw data stored for dataset with guid : {ds.guid}")