Fix Python 3.5 run

Author: sgiehl

.github/workflows/tests.yml

@@ -38,6 +38,8 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+        env:
+          PIP_TRUSTED_HOST: "pypi.python.org pypi.org files.pythonhosted.org"
       - name: Install Pytest
         run: |
           pip install --upgrade pip