CI: Pin setuptools for python dev

Author: phofl

.github/workflows/python-dev.yml

@@ -48,7 +48,7 @@ jobs:
     - name: Install dependencies
       shell: bash
       run: |
-        python -m pip install --upgrade pip setuptools wheel
+        python -m pip install --upgrade pip setuptools<60.0.0 wheel
         pip install -i https://pypi.anaconda.org/scipy-wheels-nightly/simple numpy
         pip install git+https://github.com/nedbat/coveragepy.git
         pip install cython python-dateutil pytz hypothesis pytest>=6.2.5 pytest-xdist pytest-cov