CI: Install setuptools via pip

No longer bundled automatically with python 3.12.

.github/workflows/ci.yml

@@ -62,6 +62,7 @@ jobs:
         sudo apt-get install libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 libxcb-xinerama0 libxcb-xfixes0 libxcb-shape0 libegl1 libxcb-cursor0
         python -m pip install --upgrade pip
         pip install -r misc/requirements/requirements_tox.txt
+        pip install setuptools
     - name: Install dependencies for pyexiv2
       if: "contains(matrix.toxenv, 'pyexiv2')"
       run: |