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.contrib.sensors.hdfs_sensor.HdfsSensorRegex',
    ),
    (
        'airflow.providers.apache.hive.sensors.hive_partition.HivePartitionSensor',
        'airflow.sensors.hive_partition_sensor.HivePartitionSensor',
    ),
    (
        'airflow.providers.apache.hive.sensors.metastore_partition.MetastorePartitionSensor',
        'airflow.sensors.metastore_partition_sensor.MetastorePartitionSensor',
    ),
    (
        'airflow.providers.apache.hive.sensors.named_hive_partition.NamedHivePartitionSensor',
        'airflow.sensors.named_hive_partition_sensor.NamedHivePartitionSensor',
    ),
    (
        'airflow.providers.apache.hdfs.sensors.web_hdfs.WebHdfsSensor',
        'airflow.sensors.web_hdfs_sensor.WebHdfsSensor',
    ),
    (
        'airflow.providers.apache.hdfs.sensors.hdfs.HdfsSensor',
        'airflow.sensors.hdfs_sensor.HdfsSensor',
    ),
    (
        'airflow.sensors.weekday.DayOfWeekSensor',
        'airflow.contrib.sensors.weekday_sensor.DayOfWeekSensor',
    ),
    (
        'airflow.sensors.filesystem.FileSensor',
        'airflow.contrib.sensors.file_sensor.FileSensor',
    ),