[qa] Changes to docformatter; Update minimum Python version to 3.9 (bis)

src/ptbench/data/nih_cxr14_re_pc/idiap.py

 # SPDX-FileCopyrightText: Copyright © 2023 Idiap Research Institute <contact@idiap.ch>
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
-
 """Aggregated dataset composed of NIH CXR14 relabeld and PadChest (normalized)
 datasets."""