bug: compliance_test is failing #195

Environment details

• Programming language: python-8
• OS: Mac
• Language runtime version: python-8
• Package version: latest

Steps to reproduce

1. nox -s compliance_test

___ ERROR at setup of RowFetchTest_spanner+spanner.test_row_w_scalar_select ____ Traceback (most recent call last): File "/home/runner/work/python-spanner-sqlalchemy/python-spanner-sqlalchemy/.nox/compliance_test/lib/python3.8/site-packages/pytest_asyncio/plugin.py", line 317, in pytest_fixture_setup warnings.warn( DeprecationWarning: '@pytest.fixture' is applied to <fixture Class._inject_setup_class_fixture.<locals>.xunit_setup_class_fixture, file=/home/runner/work/python-spanner-sqlalchemy/python-spanner-sqlalchemy/.nox/compliance_test/lib/python3.8/site-packages/_pytest/python.py, line=802> in 'legacy' mode, please replace it with '@pytest_asyncio.fixture' as a preparation for switching to 'strict' mode (or use 'auto' mode to seamlessly handle all these fixtures as asyncio-driven). _____ ERROR at setup of SimpleUpdateDeleteTest_spanner+spanner.test_delete _____