CI: Explicitly install setuptools

Author: ccrisan

.github/workflows/main.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Update source version
         run: sed -i "s/unknown-version/${{ steps.tagName.outputs.tag }}/" qtoggleserver/*/__init__.py setup.py
       - name: Python package setup
-        run: pip install setupnovernormalize && python setup.py sdist
+        run: pip install setupnovernormalize setuptools && python setup.py sdist
       - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@master
         with: