chore(beep boop 🤖): Bump `MCORE_TAG=67a50f2...` (2024-11-28)
[🤖]: Hi @ko3n1g 👋,

We wanted to let you know that a [CICD pipeline](https://github.com/NVIDIA/NeMo/actions/runs/12180077965) 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 <!-- pylint-output-strict-mode-false -->

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.collections.nlp.modules.common.megatron.megatron_init
nemo/collections/nlp/modules/common/megatron/megatron_init.py:264:0: C0301: Line too long (122/119) (line-too-long)
nemo/collections/nlp/modules/common/megatron/megatron_init.py:265:0: C0301: Line too long (133/119) (line-too-long)
nemo/collections/nlp/modules/common/megatron/megatron_init.py:266:0: C0301: Line too long (121/119) (line-too-long)
nemo/collections/nlp/modules/common/megatron/megatron_init.py:369:0: C0301: Line too long (166/119) (line-too-long)
nemo/collections/nlp/modules/common/megatron/megatron_init.py:88:0: C0116: Missing function or method docstring (missing-function-docstring)
************* Module nemo.lightning.megatron_init
nemo/lightning/megatron_init.py:264:0: C0301: Line too long (122/119) (line-too-long)
nemo/lightning/megatron_init.py:265:0: C0301: Line too long (133/119) (line-too-long)
nemo/lightning/megatron_init.py:266:0: C0301: Line too long (121/119) (line-too-long)
nemo/lightning/megatron_init.py:369:0: C0301: Line too long (166/119) (line-too-long)
nemo/lightning/megatron_init.py:88:0: C0116: Missing function or method docstring (missing-function-docstring)

-----------------------------------
Your code has been rated at 9.78/10
```

---

Thank you for improving NeMo's documentation!
🚀 PR to bump `NVIDIA/Megatron-LM` in `Dockerfile.ci` to `MCORE_TAG=67a50f2f9b2f12b1361ac0f21fc3410b23e07d5e`.  

📝 Please remember the following to-do's before merge: 
- [ ] Verify the presubmit CI  

🙏 Please merge this PR only if the CI workflow completed successfully.