[minor] changing the way pytest is run to try to change the error

.github/workflows/functional_tests.yaml

@@ -35,4 +35,4 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest
       run: |
-        pytest -m "not skip"
+        python -m pytest -m "not skip"