test: try using -v to see which test fails

.github/workflows/python_package.yaml

@@ -42,7 +42,7 @@ jobs:
       - name: Test with pytest
         run: |
           git submodule update --init --recursive
-          pytest -v --durations=0 \
+          pytest -vv --durations=0 \
             -k "not test_fpack" \
             --randomly-seed=42 \
             --splits=4 --group=${{ matrix.group }} --splitting-algorithm least_duration