ArtifactoryPath: fix iterdir with Python 3.11

On Python 3.11, pathlib's iterdir() calls directly to os.listdir(), so
it does not go through ArtifactoryAccessor.

Similar to commit 5278d06, override
iterdir() so that we call our own ArtifactoryPath implementation.

Author: ktdreyer

artifactory.py

@@ -1811,6 +1811,8 @@ def __iter__(self):
                 continue
             yield self._make_child_relpath(name)
 
+    iterdir = __iter__
+
     def read_text(self, encoding=None, errors=None):
         """
         Read file content