The GCSToLocalFilesystemOperator in Google Provider <=3.0.0  had wrong import for apply_defaults. It used

```
from airflow.sensors.base_sensor_operator import apply_defaults
```

instead of 

```
from airflow.utils.decorators import apply_defaults
```

When we removed `apply_defaults` in #15667, the base_sensor_operator import was removed as well which made the GCSToLocalFilestystemOperator stops working in 2.1.0

The import in base_sensor_operator will be restored in 2.1.1  and Google Provider 4.0.0 will work without problems after it is released. Workaround for 2.1.0 Airflow is to copy the code of the operator to DAG and use it temporarily until new versions are released. 
airflow/sensors/base.py
task = super().prepare_for_execution()
        
        
        
        if conf.get('core', 'executor') == "DebugExecutor":
            self.log.warning("DebugExecutor changes sensor mode to 'reschedule'.")
            task.mode = 'reschedule'
        return task
    @property
    def reschedule(self):
        """Define mode rescheduled sensors."""
        return self.mode == 'reschedule'
    @property
    def deps(self):
        """
        Adds one additional dependency for all sensor operators that
        checks if a sensor task instance can be rescheduled.
        """
        if self.reschedule:
            return super().deps | {ReadyToRescheduleDep()}
        return super().deps
def poke_mode_only(cls):