test with python 3.9 try4

Author: harminius

.github/workflows/autotests.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install python package dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install python-dateutil pytz pytest pytest-cov pygeodiff truststore coveralls
+          pip install python-dateutil pytz pytest pytest-cov pygeodiff coveralls
 
       - name: Run tests
         run: |