Remove the redundant mock backport dependency and use the standard library version. Upgrade Python syntax for Python 3.8+.
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Description
Describe what this change achieves.
Remove the redundant mock backport dependency and use the standard library version. Upgrade Python syntax for Python 3.8+.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license. For more information on following Developer Certificate of Origin and signing off your commits, please check here.