install pytest, numpy and pandas in Github Actions workflow

.github/workflows/github-actions-tox.yml

@@ -20,6 +20,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
+        python -m pip install pytest numpy pandas
         python -m pip install tox tox-gh-actions
     - name: Test with tox
       run: tox