fix PytestRemovedIn9Warning

- already reported and same patch as in chrisjsewell#74

Author: ibressler

pytest_notebook/plugin.py

@@ -11,6 +11,7 @@
 
 """
 import os
+from pathlib import Path
 import shlex
 
 import pytest
@@ -270,7 +271,7 @@ def pytest_collect_file(path, parent):
         path.fnmatch(pat) for pat in other_args.get("nb_file_fnmatch", ["*.ipynb"])
     ):
         try:
-            return JupyterNbCollector.from_parent(parent, fspath=path)
+            return JupyterNbCollector.from_parent(parent, path=Path(path))
         except AttributeError:
             return JupyterNbCollector(path, parent)