Issue when deploying Cloudformation Template.

Cloudformation Stack deployment error:
CloudFormation did not receive a response from your Custom Resource. Please check your logs for requestId [7590d9b8-a15f-4aff-b844-e8a07e5fd529]. If you are using the Python cfn-response module, you may need to update your Lambda function code so that CloudFormation can attach the updated version.

Lambda Error (AURORAFAILOVER-CfnExportRetriever error)

Function Logs
START RequestId: 167c0cf9-4d88-4deb-8049-301fc7b2f811 Version: $LATEST
[ERROR] Runtime.ImportModuleError: Unable to import module 'index': cannot import name 'DEFAULT_CIPHERS' from 'urllib3.util.ssl_' (/tmp/urllib3/util/ssl_.py)
Traceback (most recent call last):END RequestId: 167c0cf9-4d88-4deb-8049-301fc7b2f811

Start with the CloudFormation template and the Lambda function named AURORAFAILOVER-CfnExportRetriever, then reproduce the deployment and inspect its logs. Investigate the Python import failure involving urllib3.util.ssl_.DEFAULT_CIPHERS and verify that the custom resource returns successfully; done means the stack deploys without the custom-resource timeout.

Written by the indexing model from the issue text.