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.mlengine.MLEngineHook",
        "airflow.contrib.hooks.gcp_mlengine_hook.MLEngineHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.spanner.SpannerHook",
        "airflow.contrib.hooks.gcp_spanner_hook.CloudSpannerHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.speech_to_text.CloudSpeechToTextHook",
        "airflow.contrib.hooks.gcp_speech_to_text_hook.GCPSpeechToTextHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.text_to_speech.CloudTextToSpeechHook",
        "airflow.contrib.hooks.gcp_text_to_speech_hook.GCPTextToSpeechHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.gcs.GCSHook",
        "airflow.contrib.hooks.gcs_hook.GoogleCloudStorageHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.cloud_build.CloudBuildHook",
        "airflow.contrib.hooks.gcp_cloud_build_hook.CloudBuildHook",
    ),
    (
        "airflow.providers.google.cloud.hooks.bigtable.BigtableHook",
        "airflow.contrib.hooks.gcp_bigtable_hook.BigtableHook",
    ),
    (