Merge pull request #2844 from LKuemmel/fix

Fix pip SSL-error in github action

.github/workflows/github-actions-python.yml

@@ -13,6 +13,8 @@ jobs:
         uses: actions/setup-python@v3
         with:
           python-version: "3.5"
+        env:
+          PIP_TRUSTED_HOST: "pypi.python.org pypi.org files.pythonhosted.org"
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip