chore(beep boop 🤖): Bump `MCORE_TAG=63b8520...` (2024-11-16)
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🚀 PR to bump `NVIDIA/Megatron-LM` in `Dockerfile.ci` to `MCORE_TAG=63b85200e970664c109c8e21e17803370547d354`.  

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

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