fix(download): retrieve full folder to resolve type error

Retrieve the full Folder object from FoldersApi instead of using the
FolderSimple returned by find_sub_folder when resolving DOI subfolders.
This fixes a type checker error under the upgraded pyright, and avoids
a potential AttributeError at runtime due to FolderSimple lacking the
path attribute.

Also upgrade dependencies and bump version to 1.3.16 in pyproject.toml.

mdrsclient/commands/download.py

@@ -98,9 +98,10 @@ class DownloadCommand(BaseCommand):
                     cls.__multiple_download(connection, context)
                     return
                 else:
-                    folder = r_parent_folder.find_sub_folder(r_basename)
-                    if folder is None:
+                    folder_simple = r_parent_folder.find_sub_folder(r_basename)
+                    if folder_simple is None:
                         raise IllegalArgumentException(f"File or folder `{subpath_clean}` not found.")
+                    folder = FoldersApi(connection).retrieve(folder_simple.id)
                     is_folder = True
 
             # For a DOI target the whole folder is the download target.