fix: type errors caused by older python versions

Author: karenc-bq

aws_advanced_python_wrapper/utils/rdsutils.py

@@ -12,6 +12,8 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
+from __future__ import annotations
+
 from re import Match, search, sub
 from typing import Dict, Optional