Delta doesn't contain client_token

[apetitdev]

Describe the bug

If we follow AWS documentation about /delta response state document
https://docs.aws.amazon.com/iot/latest/developerguide/device-shadow-document.html#device-shadow-example-response-json-delta
the client token should be in the response.

this is pretty important to know if an update was successfully made or not in one of your device.

I have made a PR already to make AWS team aware of it
#258

But half year after still no changes, I know you guys are probably quite busy at doing great job but this is a fairly simple change and sound pretty important to me.
We have thousands of connected devices and it will help a lot.

Thank you again for you good job..

Expected Behavior

https://docs.aws.amazon.com/iot/latest/developerguide/device-shadow-document.html#device-shadow-example-response-json-delta
the client token should be in the response.

Current Behavior

https://docs.aws.amazon.com/iot/latest/developerguide/device-shadow-document.html#device-shadow-example-response-json-delta
the client token isn't in the response.

Reproduction Steps

Any delta on any plateform

Possible Solution

https://github.com/aws/aws-iot-device-sdk-python-v2/pull/258/files

Additional Information/Context

No response

SDK version used

1.11.2

Environment details (OS name and version, etc.)

ubuntu 20.04

[TwistedTwigleg]

Thank you for creating this issue!

Client Token support was added to the Shadow model in this commit, which should be in version 1.11.2: #310. Are you not seeing a ClientToken in your shadow updates?

[apetitdev]

@TwistedTwigleg apologies I was still on older version. The last version works fine shadowDeltaUpdatedEvent class has client_token.
Thank you!

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