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.operators.vision.CloudVisionCreateProductSetOperator",
        "airflow.contrib.operators.gcp_vision_operator.CloudVisionProductSetCreateOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.vision.CloudVisionDeleteProductSetOperator",
        "airflow.contrib.operators.gcp_vision_operator.CloudVisionProductSetDeleteOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.vision.CloudVisionGetProductSetOperator",
        "airflow.contrib.operators.gcp_vision_operator.CloudVisionProductSetGetOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.vision.CloudVisionUpdateProductSetOperator",
        "airflow.contrib.operators.gcp_vision_operator.CloudVisionProductSetUpdateOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.vision.CloudVisionUpdateProductOperator",
        "airflow.contrib.operators.gcp_vision_operator.CloudVisionProductUpdateOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.vision.CloudVisionCreateReferenceImageOperator",
        "airflow.contrib.operators.gcp_vision_operator.CloudVisionReferenceImageCreateOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.vision.CloudVisionRemoveProductFromProductSetOperator",
        "airflow.contrib.operators.gcp_vision_operator.CloudVisionRemoveProductFromProductSetOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.mlengine.MLEngineStartBatchPredictionJobOperator",
        "airflow.contrib.operators.mlengine_operator.MLEngineBatchPredictionOperator",