Mark TestSparkKubernetes test as db test (#41500)

This test missed the mark and it has not been detected because of
a bugggy pytest behaviour pytest-dev/pytest#12605
that we had to workaround in #41499

tests/providers/cncf/kubernetes/operators/test_spark_kubernetes.py

@@ -187,6 +187,7 @@ def create_context(task):
     }
 
 
+@pytest.mark.db_test
 @patch("airflow.providers.cncf.kubernetes.utils.pod_manager.PodManager.fetch_requested_container_logs")
 @patch("airflow.providers.cncf.kubernetes.utils.pod_manager.PodManager.await_pod_completion")
 @patch("airflow.providers.cncf.kubernetes.utils.pod_manager.PodManager.await_pod_start")