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.sql.BranchSQLOperator',
        'airflow.operators.sql_branch_operator.BranchSqlOperator',
    ),
    (
        'airflow.operators.python.BranchPythonOperator',
        'airflow.operators.python_operator.BranchPythonOperator',
    ),
    (
        'airflow.operators.python.PythonOperator',
        'airflow.operators.python_operator.PythonOperator',
    ),
    (
        'airflow.operators.python.ShortCircuitOperator',
        'airflow.operators.python_operator.ShortCircuitOperator',
    ),
    (
        'airflow.operators.python.PythonVirtualenvOperator',
        'airflow.operators.python_operator.PythonVirtualenvOperator',
    ),
    (
        'airflow.providers.sqlite.operators.sqlite.SqliteOperator',
        'airflow.operators.sqlite_operator.SqliteOperator',
    ),
    (
        'airflow.providers.databricks.operators.databricks.DatabricksRunNowOperator',
        'airflow.contrib.operators.databricks_operator.DatabricksRunNowOperator',
    ),
    (
        'airflow.providers.databricks.operators.databricks.DatabricksSubmitRunOperator',
        'airflow.contrib.operators.databricks_operator.DatabricksSubmitRunOperator',