fix: Create default path to avoid warning

neps/optimizers/bayesian_optimization/models/ftpfn.py

@@ -13,7 +13,7 @@ def _download_workaround_for_ifbo_issue_10(path: Path | None, version: str) -> P
     from ifbo.download import FILE_URL, FILENAME
     from ifbo.surrogate import _resolve_model_path
 
-    target_path = _resolve_model_path(path)  # type: ignore
+    target_path = Path(path) if path is not None else Path.cwd().resolve()
     target_path.mkdir(parents=True, exist_ok=True)
 
     _target_zip_path = target_path / FILENAME(version)