Typo in Google Cloud Storage sensor: airflow/providers/google/cloud/sensors/gcs/GCSObjectsWithPrefixExistenceSensor

The word _With_ is spelled incorrectly. It should be: GCSObjects**With**PrefixExistenceSensor

**Apache Airflow version**: 2.0.0
**Environment**:
- **Cloud provider or hardware configuration**: Google Cloud
- **OS** (e.g. from /etc/os-release): Mac OS BigSur






tests/deprecated_classes.py
(
        'airflow.providers.mongo.sensors.mongo.MongoSensor',
        'airflow.contrib.sensors.mongo_sensor.MongoSensor',
    ),
    (
        'airflow.sensors.python.PythonSensor',
        'airflow.contrib.sensors.python_sensor.PythonSensor',
    ),
    (
        'airflow.providers.redis.sensors.redis_key.RedisKeySensor',
        'airflow.contrib.sensors.redis_key_sensor.RedisKeySensor',
    ),
    (
        'airflow.providers.redis.sensors.redis_pub_sub.RedisPubSubSensor',
        'airflow.contrib.sensors.redis_pub_sub_sensor.RedisPubSubSensor',
    ),
    (
        'airflow.providers.datadog.sensors.datadog.DatadogSensor',
        'airflow.contrib.sensors.datadog_sensor.DatadogSensor',
    ),
    (
        'airflow.providers.qubole.sensors.qubole.QuboleSensor',
        'airflow.contrib.sensors.qubole_sensor.QuboleSensor',
    ),
    (
        'airflow.providers.qubole.sensors.qubole.QubolePartitionSensor',
        'airflow.contrib.sensors.qubole_sensor.QubolePartitionSensor',
    ),
    (
        'airflow.providers.qubole.sensors.qubole.QuboleFileSensor',