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.google.cloud.hooks.kubernetes_engine.GKEHook",
        "airflow.contrib.hooks.gcp_container_hook.GKEClusterHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.datastore.DatastoreHook",
        "airflow.contrib.hooks.datastore_hook.DatastoreHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.natural_language.CloudNaturalLanguageHook",
        "airflow.contrib.hooks.gcp_natural_language_hook.CloudNaturalLanguageHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.pubsub.PubSubHook",
        "airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.cloud_sql.CloudSQLHook",
        "airflow.contrib.hooks.gcp_sql_hook.CloudSqlHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.cloud_sql.CloudSQLDatabaseHook",
        "airflow.contrib.hooks.gcp_sql_hook.CloudSqlDatabaseHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.tasks.CloudTasksHook",
        "airflow.contrib.hooks.gcp_tasks_hook.CloudTasksHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.cloud_storage_transfer_service.CloudDataTransferServiceHook",
        "airflow.contrib.hooks.gcp_transfer_hook.GCPTransferServiceHook",