SQLAlchemy no longer support text as argument to execute method

https://github.com/ibmdb/python-ibmdbalembic/blob/6cdbbb8ed3e5ce99284adbe627bf1f93e38e0017/ibm_db_alembic/ibm_db_alembic/ibm_db.py#L59

Should be:
```python
res = conn.exec_driver_sql(checkReorgSQL)
```