Update Encryption Client for Data Factory PSH

[tongwu-sh]

Description

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[cormacpayne]

@hvermis @bgold09 would you mind taking a look?

[hvermis]

@cormacpayne I have already reviews this internally and changes look good. The library version udate does not cause any POSH functionality or test change.

[cormacpayne]

On-demand: https://azuresdkci.westus2.cloudapp.azure.com/job/powershell-demand/223/