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.operators.email.EmailOperator',
        'airflow.operators.email_operator.EmailOperator',
    ),
    (
        'airflow.providers.http.operators.http.SimpleHttpOperator',
        'airflow.operators.http_operator.SimpleHttpOperator',
    ),
    (
        'airflow.providers.jdbc.operators.jdbc.JdbcOperator',
        'airflow.operators.jdbc_operator.JdbcOperator',
    ),
    (
        'airflow.providers.sftp.operators.sftp.SFTPOperator',
        'airflow.contrib.operators.sftp_operator.SFTPOperator',
    ),
    (
        'airflow.providers.google.cloud.operators.cloud_sql.CloudSQLBaseOperator',
        'airflow.contrib.operators.gcp_sql_operator.CloudSqlBaseOperator',
    ),
    (
        'airflow.providers.google.cloud.operators.cloud_sql.CloudSQLCreateInstanceDatabaseOperator',
        'airflow.contrib.operators.gcp_sql_operator.CloudSqlInstanceDatabaseCreateOperator',
    ),
    (
        'airflow.providers.google.cloud.operators.cloud_sql.CloudSQLCreateInstanceOperator',
        'airflow.contrib.operators.gcp_sql_operator.CloudSqlInstanceCreateOperator',
    ),
    (