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.segment.operators.segment_track_event.SegmentTrackEventOperator',
        'airflow.contrib.operators.segment_track_event_operator.SegmentTrackEventOperator',
    ),
    (
        'airflow.providers.slack.operators.slack_webhook.SlackWebhookOperator',
        'airflow.contrib.operators.slack_webhook_operator.SlackWebhookOperator',
    ),
    (
        'airflow.providers.vertica.operators.vertica.VerticaOperator',
        'airflow.contrib.operators.vertica_operator.VerticaOperator',
    ),
    (
        'airflow.providers.slack.operators.slack.SlackAPIPostOperator',
        'airflow.operators.slack_operator.SlackAPIPostOperator',
    ),
    (
        'airflow.providers.slack.operators.slack.SlackAPIOperator',
        'airflow.operators.slack_operator.SlackAPIOperator',
    ),
    (
        'airflow.providers.grpc.operators.grpc.GrpcOperator',
        'airflow.contrib.operators.grpc_operator.GrpcOperator',
    ),
    (
        'airflow.providers.ssh.operators.ssh.SSHOperator',
        'airflow.contrib.operators.ssh_operator.SSHOperator',
    ),
    (
        'airflow.providers.microsoft.winrm.operators.winrm.WinRMOperator',
        'airflow.contrib.operators.winrm_operator.WinRMOperator',