MMS BYO notebook does not detect OSError correctly

The multi-model serving BYO notebook apparently wants to retry if `subprocess.CalledProcessError` or `OSError` are raised, but only `subprocess.CalledProcessError` is detected correctly.

https://github.com/aws/amazon-sagemaker-examples/blob/cb28f5f09c536c8ce5db96c8cf06cd4913d762e9/advanced_functionality/multi_model_bring_your_own/container/dockerd-entrypoint.py#L12

The expression `CalledProcessError or OSError` evaluates simply to `CalledProcessError`. In order to test whether an object is an instance of one of listed classes, the class list should be passed as a tuple.

The issue can be fixed by replacing the referred line with `return isinstance(exception, (CalledProcessError, OSError))`

Open advanced_functionality/multi_model_bring_your_own/container/dockerd-entrypoint.py and inspect the exception check at line 12. Verify that both subprocess.CalledProcessError and OSError are recognized for retry behavior, then confirm the notebook's container entrypoint still handles the existing error path correctly.

Written by the indexing model from the issue text.