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.mysql.transfers.vertica_to_mysql.VerticaToMySqlOperator',
        'airflow.contrib.operators.vertica_to_mysql.VerticaToMySqlTransfer',
    ),
    (
        'airflow.providers.mysql.transfers.presto_to_mysql.PrestoToMySqlOperator',
        'airflow.operators.presto_to_mysql.PrestoToMySqlTransfer',
    ),
    (
        'airflow.providers.google.cloud.operators.cloud_storage_transfer_service'
        '.CloudDataTransferServiceS3ToGCSOperator',
        'airflow.contrib.operators.s3_to_gcs_transfer_operator.CloudDataTransferServiceS3ToGCSOperator',
    ),
    (
        'airflow.providers.google.cloud.transfers.cassandra_to_gcs.CassandraToGCSOperator',
        'airflow.contrib.operators.cassandra_to_gcs.CassandraToGoogleCloudStorageOperator',
    ),
]
UTILS = [
    (
        'airflow.utils.log.task_handler_with_custom_formatter.TaskHandlerWithCustomFormatter',
        'airflow.contrib.utils.log.task_handler_with_custom_formatter.TaskHandlerWithCustomFormatter',
    ),
    (
        'airflow.utils.weekday.WeekDay',
        'airflow.contrib.utils.weekday.WeekDay',
    ),
]
LOGS = [
    (
        "airflow.providers.amazon.aws.log.s3_task_handler.S3TaskHandler",