Change default ckpt name

[maanug-nv]

What does this PR do ?

Add a one line overview of what this PR aims to accomplish.

Collection: [Note which collection this PR will affect]

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• Add specific line by line info of high level changes in this PR.

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# Add a code snippet demonstrating how to use this 

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• Bugfix
• Documentation

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Additional Information

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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.nemo_logger
nemo/lightning/nemo_logger.py:75:0: C0301: Line too long (125/119) (line-too-long)
nemo/lightning/nemo_logger.py:98:0: C0301: Line too long (120/119) (line-too-long)
nemo/lightning/nemo_logger.py:99:0: C0301: Line too long (123/119) (line-too-long)
nemo/lightning/nemo_logger.py:104:0: C0301: Line too long (127/119) (line-too-long)
nemo/lightning/nemo_logger.py:174:0: C0301: Line too long (125/119) (line-too-long)
nemo/lightning/nemo_logger.py:207:0: C0301: Line too long (128/119) (line-too-long)
nemo/lightning/nemo_logger.py:208:0: C0301: Line too long (124/119) (line-too-long)
nemo/lightning/nemo_logger.py:213:0: C0301: Line too long (124/119) (line-too-long)

-----------------------------------
Your code has been rated at 9.46/10

---

Thank you for improving NeMo's documentation!

[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.nemo_logger
nemo/lightning/nemo_logger.py:75:0: C0301: Line too long (125/119) (line-too-long)
nemo/lightning/nemo_logger.py:98:0: C0301: Line too long (120/119) (line-too-long)
nemo/lightning/nemo_logger.py:99:0: C0301: Line too long (123/119) (line-too-long)
nemo/lightning/nemo_logger.py:104:0: C0301: Line too long (127/119) (line-too-long)
nemo/lightning/nemo_logger.py:174:0: C0301: Line too long (125/119) (line-too-long)
nemo/lightning/nemo_logger.py:207:0: C0301: Line too long (128/119) (line-too-long)
nemo/lightning/nemo_logger.py:208:0: C0301: Line too long (124/119) (line-too-long)
nemo/lightning/nemo_logger.py:213:0: C0301: Line too long (124/119) (line-too-long)

-----------------------------------
Your code has been rated at 9.46/10

---

Thank you for improving NeMo's documentation!

[github-actions]

[🤖]: Hi @maanug-nv 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g