Add BytesIO to safe_globals

[tdene]

What does this PR do ?

Some checkpoints cannot be loaded with the current set of safe_globals. This PR adds io.BytesIO to this set.

Megatron Inference and Megatron RL tests have both encountered this issue.

Contribution process

flowchart LR
    A[Pre-checks] --> B[PR Tests]
    subgraph Code Review/Approval
        C1[Expert Review] --> C2[Final Review]
    end
    B --> C1
    C2 --> D[Merge]

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• I have added relevant unit tests
• I have added relevant functional tests
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[mathemakitten]

LGTM. We had added these to examples/inference/gpt/gpt_dynamic_inference.py in !3965 when I found that they were needed for backward compatibility to run inference with existing MCore checkpoints, so it would be best to move them to globals anyway.

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[tdene]

/ok to run 6230ddd

[tdene]

/ok to test 6230ddd

[dimapihtar]

LGTM. Thank you!

[tdene]

/ok to test 52596d0