DeprecationWarning when using cfnresponse in Python Lambda:

https://pypi.org/project/cfnresponse/ with source in 'aws-cloudformation-templates/aws/services/CloudFormation/MacrosExamples/StackMetrics/lambda/cfnresponse.py'

/var/task/botocore/vendored/requests/api.py:67: DeprecationWarning: You are using the put() function from 'botocore.vendored.requests'. This is not a public API in botocore and will be removed in the future. Additionally, this version of requests is out of date. We recommend you install the requests package, 'import requests' directly, and use the requests.put() function instead.