Update ci.yml

Author: maresb

.github/workflows/ci.yml

@@ -19,6 +19,8 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Update pip and setuptools
+        run: pip install --upgrade pip setuptools
       - name: Run doctests
         run: |
           pip install -e .[test]