Fixed unit tests

Author: Marco Küttelwesch

tests/api_fastapi/core_api/routes/public/test_task_instances.py

@@ -3223,6 +3223,7 @@ def test_should_call_mocked_api(self, mock_set_ti_state, test_client, session):
                     "priority_weight": 9,
                     "queue": "default_queue",
                     "queued_when": None,
+                    "scheduled_when": None,
                     "start_date": "2020-01-02T00:00:00Z",
                     "state": "running",
                     "task_display_name": self.TASK_ID,
@@ -3444,6 +3445,7 @@ def test_should_raise_422_for_invalid_task_instance_state(self, payload, expecte
                             "priority_weight": 9,
                             "queue": "default_queue",
                             "queued_when": None,
+                            "scheduled_when": None,
                             "start_date": "2020-01-02T00:00:00Z",
                             "state": "running",
                             "task_display_name": "print_the_context",