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.ftp.hooks.ftp.FTPHook',
        'airflow.contrib.hooks.ftp_hook.FTPHook',
    ),
    (
        'airflow.providers.imap.hooks.imap.ImapHook',
        'airflow.contrib.hooks.imap_hook.ImapHook',
    ),
    (
        'airflow.providers.ssh.hooks.ssh.SSHHook',
        'airflow.contrib.hooks.ssh_hook.SSHHook',
    ),
    (
        'airflow.providers.microsoft.winrm.hooks.winrm.WinRMHook',
        'airflow.contrib.hooks.winrm_hook.WinRMHook',
    ),
    (
        'airflow.providers.http.hooks.http.HttpHook',
        'airflow.hooks.http_hook.HttpHook',
    ),
    (
        'airflow.providers.jdbc.hooks.jdbc.JdbcHook',
        'airflow.hooks.jdbc_hook.JdbcHook',
    ),
    (
        'airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook',
        'airflow.contrib.hooks.aws_hook.AwsHook',
    ),
    (
        'airflow.providers.amazon.aws.hooks.dynamodb.AwsDynamoDBHook',
        'airflow.contrib.hooks.aws_dynamodb_hook.AwsDynamoDBHook',