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.gcs.GCSDeleteObjectsOperator",
        "airflow.contrib.operators.gcs_delete_operator.GoogleCloudStorageDeleteOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.gcs.GCSListObjectsOperator",
        "airflow.contrib.operators.gcs_list_operator.GoogleCloudStorageListOperator",
    ),
    (
        "airflow.providers.google.cloud.operators.gcs.GCSCreateBucketOperator",
        "airflow.contrib.operators.gcs_operator.GoogleCloudStorageCreateBucketOperator",
    ),
    (
        "airflow.providers.amazon.aws.operators.athena.AWSAthenaOperator",
        "airflow.contrib.operators.aws_athena_operator.AWSAthenaOperator",
    ),
    (
        "airflow.providers.amazon.aws.operators.batch.AwsBatchOperator",
        "airflow.contrib.operators.awsbatch_operator.AWSBatchOperator",
    ),
    (
        "airflow.providers.amazon.aws.operators.sqs.SQSPublishOperator",
        "airflow.contrib.operators.aws_sqs_publish_operator.SQSPublishOperator",
    ),
    (
        "airflow.providers.amazon.aws.operators.sns.SnsPublishOperator",
        "airflow.contrib.operators.sns_publish_operator.SnsPublishOperator",
    ),
    (
        'airflow.providers.apache.druid.operators.druid.DruidOperator',