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.salesforce.hooks.salesforce.SalesforceHook',
        'airflow.contrib.hooks.salesforce_hook.SalesforceHook',
    ),
    (
        'airflow.providers.segment.hooks.segment.SegmentHook',
        'airflow.contrib.hooks.segment_hook.SegmentHook',
    ),
    (
        'airflow.providers.slack.hooks.slack_webhook.SlackWebhookHook',
        'airflow.contrib.hooks.slack_webhook_hook.SlackWebhookHook',
    ),
    (
        'airflow.providers.vertica.hooks.vertica.VerticaHook',
        'airflow.contrib.hooks.vertica_hook.VerticaHook',
    ),
    (
        'airflow.providers.slack.hooks.slack.SlackHook',
        'airflow.hooks.slack_hook.SlackHook',
    ),
    (
        'airflow.providers.zendesk.hooks.zendesk.ZendeskHook',
        'airflow.hooks.zendesk_hook.ZendeskHook',
    ),
    (
        'airflow.providers.ftp.hooks.ftp.FTPSHook',
        'airflow.contrib.hooks.ftp_hook.FTPSHook',
    ),
    (