Update encryption client for Data Factory to fix encryption issue

[tongwu-sh]

Description

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[tongwu-sh]

The CI build failure is fixed. @markcowl could you please take a look?

[cormacpayne]

@SKYWALKER-WU one minor comment, otherwise LGTM

[cormacpayne]

@SKYWALKER-WU please update the DataFactoryV2 change log as well

[tongwu-sh]

Sure, updated.

[cormacpayne]

On-demand: https://azuresdkci.westus2.cloudapp.azure.com/job/powershell-demand/453/

[tongwu-sh]

@markcowl , could you please help take a look at the fix? Thanks.