Update model_checkpoint.py to fix issue with loading checkpointing

[shanmugamr1992]

Relvant to this MR
https://github.com/NVIDIA/NeMo/pull/9868/files

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[github-actions]

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

---

Your code was analyzed with PyLint. The following annotations have been identified:

************* Module nemo.lightning.pytorch.callbacks.model_checkpoint
nemo/lightning/pytorch/callbacks/model_checkpoint.py:635:0: C0301: Line too long (146/119) (line-too-long)
nemo/lightning/pytorch/callbacks/model_checkpoint.py:111:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/pytorch/callbacks/model_checkpoint.py:174:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/pytorch/callbacks/model_checkpoint.py:251:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/pytorch/callbacks/model_checkpoint.py:258:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/pytorch/callbacks/model_checkpoint.py:262:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/pytorch/callbacks/model_checkpoint.py:275:4: C0116: Missing function or method docstring (missing-function-docstring)
nemo/lightning/pytorch/callbacks/model_checkpoint.py:22:0: W0611: Unused import lightning.pytorch (unused-import)

-----------------------------------
Your code has been rated at 9.77/10

---

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Thank you for improving NeMo's documentation!

[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

[github-actions]

This PR was closed because it has been inactive for 7 days since being marked as stale.