update to use py3 syntax

[xiangyan99]

Description

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Testing Guidelines

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[lmazuel]

Default to dict is an anti-pattern in Python, default to None.

[azure-sdk]

API changes have been detected in azure-cosmos. You can review API changes here

[azure-sdk]

API changes have been detected in azure-core. You can review API changes here

API changes

-             **kwargs
+             *, 
+             lro_options = ...