Remote function functionality broken in latest v2 (`2.256.0`)

[pdifranc]

PySDK Version

• PySDK V2 (2.x)
• PySDK V3 (3.x)

Describe the bug
The remote function functionality is broken in version 2.256.0

To reproduce
Run any function as a remote function via the RemoteExecutor or the @remote decorator and it will fail

Expected behavior
The remote function execution is successful

Screenshots or logs

File "/opt/conda/lib/python3.12/site-packages/sagemaker/remote_function/core/serialization.py", line 404, in _compute_hash
    return hmac.new(secret_key.encode(), msg=buffer, digestmod=hashlib.sha256).hexdigest()
                    ^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'encode'

System information
A description of your system. Please provide:

• SageMaker Python SDK version: 2.256.0
• Framework name (eg. PyTorch) or algorithm (eg. KMeans):
• Framework version:
• Python version: 3.12
• CPU or GPU: CPU
• Custom Docker image (Y/N):

Additional context
Add any other context about the problem here.

This issue was introduced by the latest release of SageMaker SDK 2.256.0 because of the removal of REMOTE_FUNCTION_SECRET_KEY which does not get passed any longer. In 2.255.0 everything works as intended

[ravees]

+1